I understand being passionate about something, but in this case, you'd be better off saving until you could afford the whole thing. It may feel like you're making progress by buying things individually, but you'd be tying your money up in random parts, leaving you no cushion in case something comes up (after all, life happens).
If you don't have the money, just have patience...maybe find a C6ZO6 that is totaled from a rear end collision or something, and see if you can work a deal to get the motor out of that. Just gotta be smarter.