Made some progress on the seats. Tomorrow I plan on putting them in but I did a little prep work on the seat frame itself. Looking at the mounting feet I discovered they're riveted to the individual seat frames.
With a 3" cutoff wheel, I ground the heads of the rivets off then drove a chisel between the feet and the seat frame and pried them off. Once the feet came off, I punched the rivets through the frame.
The 4 middle feet I found out are individual just as the outers are. They are also what the middle seat is attached to. I'll cut the feet off to get a good flat bottom across the 3 seat frames. I still have 2 more to remove tomorrow before the fitting trials can happen but that won't take long.
My plan is to use the factory bench seat floor brackets as they are bolted through the floor pan where it is reinforced for strength. I'll span and bolt 2 lengths of 1.5" square tubing across the seat frames front and rear.
Seat height should be fairly close to where the factory bench sits right now. Which for me, is ideal. Although, with the driver seat being powered, I'll be able to adjust the height if needed.
Kinda hard to see here but I was able to bolt the center and passenger seat frames together.
Hunted and pecked from a Galaxy S4A.