Mr. Hettick's only real competition on ebay. I believe he also did this, which went into the $700-ish range IIRC.
This takes a style, like taking plain resin wagons and fabricating all the little details to make them into nice Squire replicas which are hot in the market right now. And you have to have enough patience to build like that for someone other than yourself, which, alas, I don't. I used to, but that's another story. I'm happy for the seller, because nothing about these successes happened overnight.