[BrianBSL]

Interesting idea, but I can tell you that the octagonal hub that 190's wheels bolted to was one of the easier parts of making the wheel. Just take a 3" square piece of aluminum and mill off the corners until you have 8 equal sides. You say only with a wood shop, but I don't know how you are going to make a roller support with only a wood shop. Casting the rollers and making the supports was the most difficult part.

I don't know how well non curved rollers would work either.