I to have started collecting parts for an AF build, Not sure about any frame differences in an 06 or 07 I bought an 07 for $250.00 A brand new rear ohlins shock sprung to my weight plus 10 pounds for 200.00, swingarm $50.00 the frame came with tripple clamps. Also purchased a set of Radiators $70.00 excellent condition from a local off road racer here in AZ. Still need lots of parts as I am trying to Install new parts IE: AVS levers new wheels, sprockets, brake rotors ( WARP 9 ) heard alot of bad stuff about the DNA wheels. All new bearings to chassis parts, new step seat. All new plastic of coarse, I will have someone make the graphic, I dont want the generic monster or one industries stuff. The only thing used will be my 2001 KX 500 motor will a new top end and a airbox mod ( CR 250 ). Running to the shop to pick up some protappers and grips Also will be installing a scotts steering dampner, never rode with a GPR so I trust the scotts/ ohlins. Looking to gear it the same as my 500. 15/44. Wish me luck this will take sometime but I want to do it right. I will stay in contact with you if its cool and maybe we can share some ideas. My plan is to race this in some BITD and score races, and pass it on to my son when he returns from his marine Corps duty. One thing im really concerned about is the brake pedal on the KX450. I had a 450 before it was stolen and I was always hitting the back brakes, it seemed short to me in 11 1/2 alpine stars.