Kickup is dependant on how low you want the rear of the body to sit. That is why you need to have the body, rear axle, tires, etc there before you build the frame.

Not to be self-serving, but go to Project $ 3K that I have been posting on, and you will see the process from bare tubing to a rolling chassis (I get a check everytime someone reads this thread , yeah, I wish.) I think there might be some good info for you there, since you are doing exactly what I am.

Don