Biggest problem I have with all of these dropped floorpans is, to have fore-and-aft adjustability you must cut a floor support crossmember- the one just in front of each seat- which weakens the whole floor structure. Choice #2- you leave the crossmembers in place and simply make a big hole in the floor, bolting the seat(s) solidly to the dropped floor with no adjustability.
With my 6'2", 200-lb body, I'm comfortable with stock floorpans- even with a helmet on, simply by having stock early seats reupholstered in good materals and adding a simple rake adjustment to the stock seat backs. We routinely make 500 mile trips with no backaches. FWIW....
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