IC2/Dave,
The seat height and tilt angle is determined by where you cut off the front legs. I just eye-balled the angle by sitting on the seat on the flat garage floor and sawed away! At present the best measurement is from the floor to the piping along the front edge of the seat where the velour starts and the vinyl edging ends and is almost exactly 9" at present but when you sit in the position the seat goes down about two inches into the padding. I had to get a tilt column to improve easement under the wheel but it is a tradeoff for each person since you have to sit high enough to have eye level through the windshield. I cut off the rear legs shorter than it turned out they needed to be since the back part of the seat sits flush on the floor on the side brackets which leaves almost exactly 4" of gap between the floor and the bottom of the seat. I can use this space to store a beach chair and some tool bags. I think you only have about a few inches of leeway on the front legs because if you cut them off too short the seat will slope forward and that is not good. My seat slopes up about 20 degrees when no one is sitting there and about level when I am sitting there. For what it is worth the seat I have is from the MIDDLE seat of a Dodge minivan.

Don Shillady
Retired Scientist. teen rodder