if you have the money to do up a zed, and the passion and the time, then go for it, you will have a nice car, but if not ure just gonna end up with something that isnt what u want, gonna have probs gonna be off the road, better to just keep what u have for a while and save for an r32
p.s will the rb26 add much weight"? if it dont meh thats gonna be one hella fast car