As easy as it is to say "go for it" I think you have a valid concern being nickled and dimed to death. Ultimatly this small stuff adds up quickly. Add to the fact that other things will creap up (tires, rust etc) you really have the potential to end with a rather large bill. I think I would look at the cost of the project taking into account all the little things as much as possible. Its only then that you can say if it is worth it.
If possible break the project down to more managable chunks. Suspension, engine, body etc. I think your project is great and I would hate to see it end but I think it will either cost a fortune or just be very long and involved. perhaps both.
If you do go ahead you better keep the car for the rest of your life, as much as we all like 944's there simply isnt a market for them that will pay what you put it. I think this applies to pretty much any custom.
these cars are expensive, fun but expensive.
Ahh to hell with it "go for it!"
