As i suppose it will be smth like 10-15.000$, but surely will take a lot of time to get such money:) too much for a student like me xD.
Good news is i have a mate who helps me. We are to do all of bodywork ourselves, including weld, rebuild and install engine (i have only r154 grbx yet). So almost all work will be made myself.
As to registering, we have strange laws here in my country:) so if i decide it'll be not a big problem to make it road legal. But main idea to build it for competitions and weekend driving.