Xavier I'm in Las Vegas as well, up on Sunrise Mtn. Looks like your short a few trim pieces like the side vents and also the interior piece for the underside of the trunk lid. I have a really nice trunk lid interior piece and I think enough extra side vents, send me a PM and their yours...................I move them every 2 or 3 years so I'd rather they got put to use then sit in drawers etc. My coupe is long past being made a street car ever again.........if only I saved those kick panels (sadly I tossed years ago)
As for the price it was more than fair.........you couldn't buy the parts on the car for $1500. Long ago I worked as a Toyota mechanic, 3TC's are great engines with lots of hop up parts available (or at least back in the day). At our local stage rally folks are still running them in Corollas and I've never seen one break. After reading your post I curious as to the disk brake conversion.........any chance that's a Corolla GTS rear end (the had a limited slip diff stock) also what gearbox is in there, I assuming it's Toyota as well.
A twin cam engine is neat but there is also nothing wrong with a Datyota or Toydat, you'll have great fun with the car no matter what you do.

Tom