In response to the OP's question, I am not sure of the manufacturer. It definitely does not appear to be a CMC/Fiberfab body. Too many differences such as the flat angle of the gas tank, the seal area around the front trunk, no inner panel under the front hood and the car seems to be a little different shape in the rear area. It also does not appear to be one of the major manufacturer's. Could this be one of the cars being built in Mexico?
I shouldn't be too critical because I may be trying to sell mine one day and would not want the criticism. However, the pictures of the engine and undercarriage do not reconcile with the comment in the ad of "Brand new". When I build brand new the underside is as shiny as the top side! I hope the sale goes well because as the prices go up it helps the value of mine get closer to what I actually have in it!