The kit itself is around 25 thousand Canadian for a rolling chassis. You basically need to assemble, finish body work, and complete the rest of the drivetrain.

There is a local gentleman who built one using a BMW V12 from an 850CSI, and he said he had around 50K invested to go from start to finish.

Edit: Just to clarify, the only work he sourced out was the actual painting. The car comes with a gel coat finish, he told me he basically assembled the entire car, trimmed openings for lights and removed casting flash, then disassembled it, had it painted, and reassembled it. If you ended up farming out the process of surface finishing and setting up all your panel gaps I'm sure it would cost you quite a few extra dollars.