Instead of posting in boys, 400E, starting new post, 400 H ,,,Hudson, STD
What would be better, using blind middle wheels, or all wheels full diameter , with blind you can over lap the wheels, full dia adds 1/2 inch to motor block,, was lucky with berk I used mc coy wheels, blind the inner, and did not have to adapt drive rod, had to make my own side rods,.. all axles are on ball bearings, think I will put in a 3/4 worm gear, little more top end, using 1-1/4 in berk. R&D
Using 6 full size wheels, might make an 042 curve ,