[65Safari65]

I'm in the middle of the same project on my 65 Safari- I think I had about the same amount of subfloor to replace. I removed the belly pan and black tank, and the most annoying part of that was the "blind rivets" on the radius. I then made a cut across the floor with a circular saw set to 5/8"- for the last 3" or so on each side, I used a handsaw "upside down" (pushing up toward the edge). This gave me a pretty clean cut with just a couple of splinters at the edge. I then cut down the middle of the bad floor to the end of the trailer. I considered trying to cut around the elevator bolts, but ended up deciding on a less delicate method... a floor jack pushing up from underneath. The bolts just rip through the old wood and then get snipped off with a bolt cutter. I first had to detach the C-channel from the back (just a few rivets), and my floor was bad enough so that the bolts around the edge weren't really doing anything anymore.
The frame right under the bath was a little ugly, but will clean up with POR15 and some new paint.

I'll be doing a different thread at some point about why if you think maybe should replace your axle, then you should do it right away. We did a 30K 2 1/2 year trip in ours with the original axle that "checked out fine". The curb side was bottoming out and we ended up with two cracks in the frame- one at each end of the axle plate! Both are repairable and we replaced our axle along the way, but it would have been nice to avoid the associated fun by knowing enough to replace it before we left.

Are you going to sandwich insulation between the wood and the frame? It seems that mine was there primarily as a habitat for small rodents of the 1970s. I do feel like there should be something there, though.

My elevator bolts get here this week (Vintage Trailer Supply), and then the reconstruction begins!