depends on how many times he's had to do things, and what he started with (stock new car, or modded car, etc).
when i go automatic later this fall, i'll have around $45k in my cobra---that's $31k purchase price brand new in '04, and roughly $14k in mods (big blower, solid rear, automatic, and all the other shit plus tuning, etc.). that's not a ton, but i did all the work myself (except the solid rear/auto).
if you look hard, you can find a 700rwhp big blower cobra with a built motor, just like the one on the video, for under $30k, that's been done correctly. that was over a year ago when i used to look a the classifieds on svtperformance--i'm sure the prices have gone down further