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'58 Bonneville Hardtop Back on the Bench! 3/20/18


John Goschke

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I love what you've done so far.working on a project like this one makes you want to move very cautiously doesn't't it?It's not like you start wacking away at these thinking that you can stop by your local hobby shop and pick up another kit and move on.You're Woking with surgical precision and doing it right the first time.I have a pair of these '58 Pontiacs that I look forward to rebuilding at some point In the future so I will enjoy watching this build progress.Be sure to check with The Modelhaus for that windshield that you need.

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Thanks for the encouraging words, gentlemen!

Bill (aka Mr. Obsessive): The top from the Revell '58 Impala did occur to me, after I'd started the swap, of course. I don't have that kit in the stash, though. The Trophy Impala roof is a bit too wide, so the best way to swap it into the Bonneville would be to use the entire thing, including windshield and rear frames from cowl to tulip panel. I just didn't want to cut up the convertible that much. The work and time saved using the Bonneville roof made up for the fact that I paid more that it would've been worth if I was buying the whole body to restore.

Curt (aka 62Rebel): The rear window from the AMT Trophy Impala has a different curvature, leaving large gaps at the lower molding.

Bob Ellis: Yes it does seem that convertibles, particularly all the AMT and SMP '58s, seem to be more common than hardtops. I think the hardtops may have been released later, perhaps after the initial kit releases proved successful - but that's just a theory. Maybe a more knowledgeable kit historian can tell us.

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  • 3 weeks later...

Thanks for the kind words everybody. Helps keep me going on this project. Haven't had a whole lot of time to work on the Bonnie – an hour here and hour there kind of thing.

Anyway, managed to add some weatherstripping and window channel along the inside edge of the roof using styrene strip. The little gap above the vent window will close up when roof finally cemented on. Also added a ledge inside the roof for the rear window to fit against.

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Shaved the "Bonneville" script off the front fenders and worked on the headlight fit, removing moldlines and refining contours around the light bezels. Also shaved those crazy fake vents off the driver's side fender (still have to do the passenger's side.) A little kit accuracy trivia: the real car has four of those things on each side while AMT added five! Rep. stockers: shave off the top one and you're good to go!

Bonne_3_5-vi.jpg

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Edited by John Goschke
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Have also been prepping parts for plating, including stripping the head and taillights, and cleaning up a second rear bumper, removing moldlines and Pontiac's non-functional "exhaust ports." Also working on the fit of this piece.

Bonne_3_8-vi.jpg

Bonne_3_9-vi.jpg

Misfortune struck last night after I had done a quick "tape 'n screw" mockup assembly to take to our club meeting when I knocked the model in its box onto the basement floor! Landed on the roof almost cracking it all the way in half. Repairable, but kind of disheartening!

Bonne_3_11-vi.jpg

Bonne_3_12-vi.jpg

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Have also been prepping parts for plating, including stripping the head and taillights, and cleaning up a second rear bumper, removing moldlines and Pontiac's non-functional "exhaust ports." Also working on the fit of this piece.

Bonne_3_8-vi.jpg

Bonne_3_9-vi.jpg

Misfortune struck last night after I had done a quick "tape 'n screw" mockup assembly to take to our club meeting when I knocked the model in its box onto the basement floor! Landed on the roof almost cracking it all the way in half. Repairable, but kind of disheartening!

Bonne_3_11-vi.jpg

Bonne_3_12-vi.jpg

Ow!!! At least it happened at this stage while you can fix it, and there was no paint. It looks so good so far though.

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Lookin good! Man,but I love those old annuals!!!! Thank you for the photo tutorial on changing a roof - Hey mods - maybe this if John keeps this a good WIP thread, it could be stickied??? I think a lot of us could learn sme things from this thread.

But John, judging by what I can see in the photographs, that hardtop body didn't look all that bad.. :mellow:.. unless there was a lot of glue damage. I ted to really like thse cars in a convertible but I admire your tenacity and resolve to have a hard top. And thank goodness - no baby buggy wheels! :D:D The normal sized tires look good on that car.. Any idea as to colors yet??? PMing you now...

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Beautiful work on this one! AMT engineered it well for this to work.

I wonder if a lot more old models will be Frankensteined together this way now since there are fewer and fewer left? I've done it with a '61 Continental already, and a '61 Bonneville is in the pipeline (which may be tough since I only have one-and-a-half windshield pillars between the two).

AMT's '59 Bonneville convertible even has little stubs of the C-pillars molded in (they're hidden by the top boot), so maybe they made the hardtop first?

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  • 4 weeks later...

Finally got the hardtop roof permanently attached after repairing the crack shown last post with Plastruct cement for ABS and styrene flowed in from the inside. I reinforced the repair on the inside with some 1/32" ABS plastic. Plastruct cement was also used to cement the roof on, with the joint between the front edge of the roof and the convertible windshield header reinforced on the inside with a narrow strip of 1/32" ABS. Some minor gaps at the header were filled with thin cyano then the windshield header was filed down and the front edge of the roof shaped before the panel line for the upper windshield molding was scribed in. The damaged driprails were shaved off and replaced with some Evergreen strip.

Bonne7_10_2-vi.jpg

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Also managed to scratch a rear window from clear PETE plastic from an egg carton. I made a pattern from a '58 Impala window, then the pattern was adjusted to fit the Bonneville. The pattern was used to cut a mockup "window" from a business card and further adjusted. The dummy window was used as a pattern to cut the final piece from the PETE. To protect the clear plastic during the cutting process I covered both sides with masking tape. Now I just have to decide whether to replace the windshield with a matching piece!

Bonne7_10_6-vi.jpg

Trim removal continued with shaving of the "Pontiac" lettering from the decklid along with the chrome fake handles. More kit inaccuracy trivia – AMT's kit spells out "Pontiac" on the hood and deck while the lettering spelled "Bonneville" on the real car!

Bonne7_10_5-vi.jpg

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I finished shaving the fake vents off the passenger's side front fender, along with lettering from the hood. Next up for removal are the "flying wing" fender ornaments!

Bonne7_10_10-vi.jpg

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What turned into the most challenging project with my worsening hand and arm tremor was using a Dremel to ream out the molded-in headlights for replacement with lenses from a Monogram (now Revell) '59 Eldorado ragtop kit. These are the most accurate GM quad lenses available, complete with nicely- done fluting and a representation of the Delco T-3 logo. After a little cleanup the housings can go to the plater. Hopefully I'll manage to get the lenses in straight during final assembly!

Bonne7_10_11-vi.jpg

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