I redesigned the frame with a rounded top and moved the rear wheels as wide as the edges of the seat. Prior to deciding to make the top frame rounded (which is an aesthetic choice) I had to make the eyes (in full scale) to test that I could indeed bend Schedule-style steel pipe with the hydraulic bender I have.
I moved the rear wheels further apart for aesthetic and practical reasons. Aesthetically, the copper model looks like forward is indeed forward owing to traditional conventions of wider wheelbases in the rear of vehicles. Practically, 24-inch diameter wheels would hit one another if the axis of rotation was only 24 inches apart.
I think it's a good decision because it'll improve stability as well — the only downfall is that it's not so clear how I want to make the whole frame come apart so I can transport it.