It's a lot of work piecing a kit together, but it can be done. What kind of experience with this sort of stuff do you have? I ask because the full kits make this project pretty easy. Piecing it together will mean you need to be able to fabricate a few things along the way, as well as be able to have your car out of services for a much longer period of time.
Also, what type of TMIC would you be running?