Ichiban Toys creates custom Lego kit instructions. They used to create kits out of authentic Lego parts.
This is one of their kits. I bought it a few years ago, put it together, kept it for a while, and now I'm selling it. I personally think it's a better BTTF DeLorean than the official Lego set, though it isn't minifig scale.
I'm attaching pictures of the kit both assembled and disassembled as well as a link with information about the kit.
I'm asking $110.00 plus actual shipping cost from zip code 55343. That's less than the $129.00 I originally paid.