Thanks all for the encouraging words. "Stout of heart," shemandr, that's good stuff! Thanks all! Here's a bit more information, Hunter216, if it helps. I'll key my comments to the added photos below. (1) View from above. Topside skin looks good, stripped of all hardware. Thankfully, I was able to do the work from below without causing any damage to it. (2) My problem all started, seemingly, with a leaky hatch. You can see the delamination around the edges, once the frame is removed. How far back did the water damage go? Tap! Tap! Tap! (3) I made a first cut around the hatch with a dremel tool, careful to cut the liner but not what was beneath. It didn't look good. Since the liner didn't seem to be connected at all to the wood above, I figured I didn't have much to lose. So . . . (4) I made another cut with the dremel straight across the boat, aft of the hatch, just before the rise of the "doghouse" (is that what you call it, the elevated headspace in the cabin?). (7) One hard knock and the whole liner let go and came down on me! Is it just glued up there? Here it is "glue" side up on my driveway. You can see the square of my first cut around the hatch, and the rest of the liner as it came down. (6) A closeup view of the backside of the liner reveals that it had separated from the plywood almost entirely. What looks like thin plywood on the liner is merely a wood grain imprint into the thin "glue" that is very brittle and cracks between the fingers (sorry about the order of the pictures.) After the liner came down, I went back in (respirator on) and pulled down most of the plywood with my fingers and small pry-bar. In a few areas I used a hammer and chisel, careful not to penetrate the outer skin. I ran a sander over it to clean it up. Note in picture (4), there is one section of the plywood that still seems to be in pretty good shape and is in solid contact with the skin. I don't know if I should tear that out or not? Would the rebuilt be easier if I removed it or left it? (5) shows the current state of things, a poor photo of a "cross section," showing the outer skin and the one remaining corner of ply (1/4" I'd guess). Finally, (8) looking aft, on the starboard side, the ply seems to be in good contact with the liner. However in photo (9) looking aft, you can see a pretty good gap developing between the ply and the liner. Do I need to keep cutting back that liner, or can I epoxy the heck out of it and jam/jack it up to the ply from below?