I've completely removed the interior of my '67 Safari (photos on my thread elsewhere). I've started to remove the entire subfloor but due to business travel and upcoming Petite LeMans at Road Atlanta, I've drifted off point. I've not surveyed the entire site for previous removal methods but I bought a good sawsall, a 1" hole saw, and have removed the Univolt and water tank. I modified the drill bit in the holesaw to seat about 1/16" longer than the holesaw teeth. I then center punch the floor-side bolts holding the sub to the crossmembers and with the holesaw bit in, drill enough to get a "seat" for the holesaw to ride in. Then I remove the bit and carefully drill until I feel the holesaw go through the plywood. I'll take the sawsall and cut the plywood into manageable sections after cutting through the bolts and expect the floor to be removable in pieces. Mine is shot in the bath area and soft at the entry door. I'm going to replace the entire subfloor. I keep photos current on my thread.