Infrasilver will be able to give you an idea of costs. It would make for a good project for somebody, the sort of thing that I'm daft enough to consider.
I would see if a reliable Indy can give you an idea on possible prices. If anybody takes it on themselves they will want a hefty discount for the unknown issues, you would quote possibly be better off financially by keeping it and getting it fixed.
Such a shame when you have had the car for such a short time, I can imagine how you feel. Sell now and it would always be a failure. Take the hit to get it fixed and you can hopefully enjoy the car for a long time.
Best of luck whatever you decide.
MC