Welcome, glad to see another builder here on the forum. There have been several builds done without a donor car, the biggest hurdle there is getting the axles right.
Another way is to get a donor pallet with all the parts already broken down and palletized. I'm pretty sure that Wayne Presley from Very cool parts ( a forum vendor) still sells them.
You'll find that people here on this forum are knowledgeable and will be more than happy to help you and spend your money. Lol