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Mostly street with a couple track days a year? A bunch of track days a year? Only needs to be streetable enough to get to the track? Does it need to be rated/certified for track use? Are you going to use a seatbelt or a harness or both?
I know the owner designer very well. Allen is a Corvette guy (C6 with a LS7) who races SCCA and have "invented" a bracket to swap out racing and street seats in less than 15 seconds--- legit.