Reason I went for the newer seats is the middle reel is integrated into the seat back, will use the chassis mount point for the twin stork.
Checked with Flux before starting, and they said as long as I tell them that the seating capacity has changed so they can update the policy no problem and no extra charge or testing required!!
Been taking pics along the way so I'll do a project thread on your forum if it works out (I'm JonB there).