Chuck is building a Hudson? Nah, that must be a typo, he hates those things! 
Looks like a good start, what are you gonna put under the hood? Make it a Hudson 6 with a huge honkin' blower on it!
Al, I've gotten a bit done on mine, hopefully I'll have some bench time tonight and get some more, we'll see how the head full of snot holds up!
I finally got the interior panels modified to fit the new chassis (thanks again for reminding me Roger!), and here's how I did it. I put my interior panels in place on the chassis, and marked where the new rear wheel wells land with a pencil. I carefully followed the pencil line with a #11 blade, then followed that line with my Trumpeter panel scriber. Once it was thin enough, I snapped the excess off, trimmed up the cut area, and tested my fit, and they both fit fine!
Stock door panel on the left, modified on the right...
Cut line marked with a pencil and ready for removal...
Lightly scribed with a #11 blade...
And deepened using the panel scriber, ready for the excess to be snapped off!
Next up is the back seat. To mark this, I used my modified door panels as a template. Once again, the line was marked with a pencil, but the cutting was done with the #11 blade only this time. Once the cuts were made, I discovered I was going to have to remove some plastic from the back side of the seat and the wheel wells to get it to fit properly. I didn't get any pics of that process, but I'll snap some later if I get to the bench.
Stock side of the back seat...
And how much has to be removed to get it to fit in the new Pro-Street chassis. Amazingly, it looks good once the door panels are in place. I need to mock it up with a spare Duster body just to check clearances, but so far it looks fine!