Most of the parts came from local scrapyards, some of the steel did come from a used metal supplier nearby. The 16 HP Kohler engine I purchased some time ago at an antique engine tractor show. I can't think of anything that I used to build this tractor that was new. The pins holding the links together on the track are half inch diameter and welded to side pieces of the chain, I used half inch black pipe cut to link width and then slipped over the pins before assembly to make a floating steel bushing on the chain.
Home made bulldozer
Home Made Bulldozer made in Ag class at Holliday High School really awsome.