Not much to report, other than the fact that I've made a lifting post to go under the roof a couple of weeks ago with the intention of gradually raising the cabin roof to it's original height hopefully in time to fit a new mast beam in the spring.
The roof has spent the last year or more sagging, so it will take a few months to gradually raise it without cracking the GRP.
The post is 2 x 2 with a threaded rod inset in a hole drilled in the end. Pads on the floor and the roof and a washer at the end of the post for a nut to push onto. Turn the nut and the threaded rod extends out of the end of the post like a DIY acro-prop. 3 quid for the wood from B&Q and threaded rod, washers and nuts out of the scrap box.
I've been on board twice. First to install the post and then again this weekend to raise the roof a bit more. Basically extending the rod until I get a fair bit of resistance against the screw. I don't want to go at it like a bull in a china shop and push the deck and cabin top from the hull.
So far I've raised the roof about 1.5 inches. Slow but steady.