I'll speak for my dad here because I've talked to him quite a bit about potentially selling them; the jist is that this was really a one of a kind, there isn't a template or anything, and a lot of the parts were things he had laying around. That being said, if someone was hypothetically buying one, it'd have to be done from scratch to specifications set by the buyer. And that wouldn't be cheap, probably 1K+. It's all done from hand and this took quite a bit of time to put everything together.