It does say it's a TT
Bad paint work will limit your selling potential, if it's an Auto you are probably going to struggle to get much over 5k with poor paint, good paint and history, could get you upto 7k (if you are patient and lucky),
but old paint can be very hard to match, especially Silver and by your description, it's very unlikely a spray shop will get a decent match just doing a roof and bonnet
I personally wouldn't spend that much on paint to sell a TT Auto, if a 6-speed it's possibly worth spending some money on, but by your estimates I am guessing it's an Auto
I am also assuming it is an Import not a UK Spec Supra