Look I was given this car as is I have done nothing to it but I would like to do something with it that's all it has all been strengthened underneath and the pillars on the windscreen I don't really caire on how much it's worth I would just like to have fun and enjoy it for what it is and if you can except that it would be great this is the closest to able to afford a 260z so why not a
If you have been given it then that should tell you something. But the good news is that you are probably able to sell parts for folding money. If this car was rough but had it's roof it would be worth something and i doubt whether you would have been given it.
IMO don't spent time or money on it.
I'm in the Midlands too and may be able to assess and guide you further but I am never going to advise you to carry on with it.