I don't believe so.
He is paying for a very nice interior that he will probably modify. He is paying for a paint job that he will probably have to redo once he adds the flairs, air dam and splitter. He will probably also do extensive work under the hood or even re-power the car. So half of what he is paying for is getting redone. Now he might have to be selective on what kind of car is the right car for this project but I am sure that can be over come. The car he linked to is heavily modded. Stripped interior, all carbon fiber, carbon fiber rear bumpers, SR20DET drive train. If he goes this route, which is fine, he will use maybe 30% of what he paid for up front.
If I wanted to build a restomod I would look for a 72 or 73 or possibly even a 260z with minimal rust. A little under the battery tray would be ok if the frame rail is good. A little in the floor would be acceptable. Maybe a little in a dogleg. Frame rails would have to be good and the rockers. If the wheel arches have some rust, who cares. Cut it out on the flare line and close them up. Add the flares and move on. I am sure I could find this car for way less than $16,000. I could get the repairs done professionally and might could even squeeze the finished paint work in there too. Which would put me money ahead of paying 16k up front then adding body work and paint on top of that
I mean, I just found with a quick search, a really clean 260 with no rust and a L28 turbo already installed for $10,500...