You wouldn't think something as simple as adjustable seat tracks and seat mounting would kick your ass but, for whatever reason, it sure kicked mine. I had serious brain issues, overthinking it and trying to over engineer it. In the end, I simply mounted the sliders to the seats, which required nutserts in the seat frame then 1/2" spacers for the slide release/locking mechanism to operate. Then marked and drilled through both levels of floor aluminum. Cut and drilled out the 5/16" studs that came swedged in the sliders, replace with grade 8 - 1/4" bolts, grind the side of thick flat washers so they fit in the seat track channel, tack weld the head of the 1/4" bolt to the washer so that it won't spin and you can run a lock nut up on it from underneath without having to hold the head in the seat track yet isn't welded to the seat track incase you need to remove it. I didn't want the aluminum panels to crush down on themselves when I tighten the bolts so I made 1" aluminum spacers, cut the foam/heat barrier to accept the spacers and sealed them with foil tape. Like I said, Simple.
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