theres a guy in ia was building those cars for people dont know the odds of one getting your way but his name is mike cooper cooper racing
There is a Mike Cooper in North Sioux City, SD (Across the river from Sioux City, IA). He builds Ultra-Lite Modifieds, but I don't know how he has marked them. I don't think he has built many in the last ten years. Also there is Medieval Chassis in Minnesota. I think they build more stock cars, but do advertise mod chassis, too.