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The 25" is measured at the center of the cowl which is a number I can't change per rule, I'm open for suggestions. I can however lower the ride height and will experiment once the BB is sitting on the floor. The 4" dimension is a starting point only. The rollbar height was a compromise, in that the plan, after the initial build with a V-8, there will be multiple drivers and engines, me being the shortest at 5-10 with enough room for a 6-2 driver. I'm doing the least amount of substructure to mount the body, then wt test, and see is we have to rethink the design. Nothing written in stone at this time.