Mike, I can't wait to see how your car turns out. It's a shame that a lot of your neat little fabricated bits will be hidden from view once the body goes on...
Box - I love the look of the old-style 15" Halibrands with the 50 series balloon tyres. The big brakes on my latest car forced me into the 17s. Here's a photo of my old Cobra and the new one. Exactly the same body, and the new car's a bit lower. The wheel sizes totally transform the look of the car. It's weird - I had 265/50/15 Yokos on 15x9" wheels, and they looked bigger than my 285/40/17 Yokos on 17x11" wheels?!?