After reading thru your post, I see you have put some serious thought into this project.
The one bit of advise from someone that has had a similar experience is write out a plan of the build Put together a excel spreadsheet with the products you are looking for and where they can be purchased and the cost. I found that it helped to keep you in a realistic check of how much it is really going to cost and how much you have spent. Little by little you can get there, but try and keep it realistic so that the scope creep doesn't overwhelm you and you get burned out on the project and give up. Set a goal to do something on the car everyday no matter how small it is.
The journey is a major part of the destination.
Keep the faith and it will get done.