1967 Aristocrat LoLiner vintage travel trailer "Kini"

First, I cut out the metal belly pan a couple inches inside where I was going to cut out the floor.   I think I just got under there with tinsnips. Once that was done, I bent   the metal down and cut the plywood, being careful not to damage the sheet metal. I saturated the exposed plywood edge with thin epoxy, then added butyl tape. Then I bent the belly pan metal up over the exposed edge.   In this picture, I think I was inserting a spacer block into a gap between the floorboard and the frame. Just out of an abundance of caution, I wrapped it with Gorilla Tape.   Not sure if there's a long-term benefit, but it's been ten years since I installed it... I didn't really get a good picture of the next step, but if we jump ahead a bit, you can see the white stripe at the bottom of the shot.   This is angle iron that bridges the gap and supports a piece of half-inch exterior plywood, which will protect the bottom of the tank. T...