Or, pull a tarp over it. Should be able to position it with lines from on deck and it'll seal against the opening. I was surprised how effective it was when I had to replace a throughhull valve and couldn't get a haulout in time.
But get one of those foam stopper, just in case.
We Canadians have the same problem - very expensive official electronic charts. Seems the OpenCPN folks have us both covered with https://www.o-charts.org/ - looks like 35EUR gets you officially sourced but "not for navigation" charts covering Australia.
I think I could take a very good guess as to the condition of the engine, radio, and fish finder, after spending a month underwater.
I saw that one a while back, a truly impressive level of wtf.
Always a good sign when a boat has spent half its life in repairs / refits.
I also liked the water jets in the keel for underwater excavation/getting unstuck after running around. Now that's a feature you don't get from Beneteau!
No idea, but he did a similar job on a C&C 30 a few years ago, and he was a yacht broker, so is probably realistic about the market. I'm sure it's somewhere between "expensive for an old 27' boat" and "way cheaper than trying to recreate it yourself".
I've got a manual impact driver that is really helpful for getting small bolts out without breaking them - a lifesaver for working on outboard motors where inevitably your work is 90% getting the bolts out, 10% doing the actual work you need. Plus you get to use a BFH which is always fun...
I'll second the exterior house paint suggestion. I've used that on a bunch of plywood/epoxy dinghies and it holds up fine, it's cheap, nice to work with. I normally go with the highest gloss available which is still not very glossy.