We opt’ed for the sliding seat option. It adds weight, but it is very nice to be able to pull a lever and move the seat forward and back.
We riveted the seat back supports, attached the sliding seat option to the bottom of the seat, trimmed the pilot seat pan to fit nicely, drew our center lines, measured 65mm out from the right of the pan, made our mark and and used the co-pilot seat pan to make our front marks. We only marked the front right position. We then measured the inboard side of the seat at the front and back to make sure that it was square and would be sliding straight forward and back. We then marked the outboard hole.
We then drilled out the two front holes and installed the blind nuts, and bolted the pilot seat in. At this point, only the front two bolts are holding it in place.