Made from no patterns and mostly pallet wood. The only "New" (purchased) wood are the axels of the units. It does have one bolt in the wagon for the steering.
The wagon was much harder to make than the tractor was.
My total material cost is about $2 for all material; no allowance for "shop costs" though. Probably $5 with that.
The air cleaner base on the tractor is a wine cork! --- Just had to do that!
I have sort of templates made for the tractor-- wagon is still being developed. Hope next one is easier.