Well, it's a good thing you have a thick skin---I apologize for jumping to conclusions too early, but I have seen young blood enthusiasm get no where without a good plan and MONEY. I do hope you succeed and build something that suits you.
Anyhow, the tube frame can be set up anyway you choose, so you are NOT stuck with the Z car suspension. You have have your cake and eat it too, and use just about anything you want that will fit within the body panels. A solid axle would be ultimately better for drag racing and an independent rear for road racing. You could also do something like a Vette rear end like Scottie, although I do not know just how much torque they can handle.
Use the search function and keep reading old posts--there are all kinds of examples of trick fabrication, but you have to find them.
Davy