front brakes and header? that jus screams bent forks to me.. how are u sure that the frame is ok? and if u were hit by a semi how is the front of the bike messed up?

In all honesty the money you would by it back for and build it into a stunt bike would be like buying 2 or 3 crappy bikes or stunt bikes. hell Knightmare (jen) had a 06 ZX6R that i was interested in buying after someone pulled out infront of her and she told me they wanted 3k and change for the bike, and the front was trashed. so figure 3-4k for the bike plus 1k in parts to make it rideable and fix the front end and then about 1k for bars, cage, sprocket, chain, etc. your talkin 5k minimum to have a 07 stunt bike.