Preparation

The angle grinder with a cut-off disk was the way to go to remove the aisle bolts. Too many of the nuts where obscured and unreachable from underneath. I found that grinding a flat on one side of the bolt head with the grinding disk first reduced the rate at which I consumed cut-off disks - it took 6 disks @$1.97 to get all the bolts cut.
You'll want to ventilate the bus well while doing this. I wore a respirator too, the combination of hot steel, burnt rubber and wood smoke was pretty nasty!
I had the traditional de-seating BBQ, 2 Daves, a Ted and The Christine showed up and made short work of it! It took us about 45 minutes to get all of the seats out (I had already cut the aisle bolts) and another hour and a half to butcher the seats for recycling.
Seat bones ready for recycling.
Tada!
Ready to get to work.
Plenty of room for wiring here.
I can probably tuck some wire in here too, the blue hose is for heat and runs all the way to the dash from the engine in the rear.