I like the leaned-forward B-pillars, but I think adding a more complimentary angle at the rear of the truck (i.e. tailgate) would make it look even better. Ditto for the windshield angle and the nose of the truck, whatever you decide to do up front.
The Vette rear body is different, but if you're using GT-40 stuff on the rest of the truck, why not use the GT-40 rear body section?
I love the sectioning you gave the truck, especially going through the hood. The stock hoods are way too tall for a rod/custom.
I started on a very similar '55 years ago when I bought the Monogram kit, and your pics reminded me why mine didn't get too far- the fenders, left stock, look massive and ruin the thinning/chopping/sectioning work which has been done on the rest of the body. I couldn't come up with a good way to decrease the massiveness of the are between the front fenders in the grille area, either, since the fenders didn't look right with the bottom few inches removed and the wheel arches moved upwards.