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jbarnes85 said..woko said..A light coloured panel board with timber cover battens, not hard to do, light reflective, access for wiring, easy clean,

Hi woko.
I had considered that with PVC boards. It does look very nice. My main issue is that the ceiling has two levels to it and I wasnt sure how to cover the sloping section in between . See photo of my boat interior.
So my current plan is to do battens covering the front section. See an example of a Cavlier 39 with ceiling battens and a piece of wood glued over that sloping section (possibly it is ply but I am not too sure). One reason I think it wont be too hard is because the end off the battens done have to be covered. I will round them with my router so they look presentable.
Could you use some lightweight ply sheets popped up into the ceiling? The battens and underlying structure, as seen in the lovely Cav 39, could cost you a fair bit of headroom.
Like you, I don't have access to a speciality wood shop - only a Bunnings. I used their marine ply for fitting out my shed and the boathouse, and certainly wouldn't have it on a boat. It's not all bad, but at least one sheet had bad voids, and there's something about the texture that un-nerves me. The specialists are happy to ship their good stuff.
In Sydney, and I assume Melbourne, there's some places that purchase salvaged timber from old houses. You can get Australian cedar, kauri floorboards and other timber that's just not around anymore. It may be worth a drive, particularly for the sloping section.
The other nice thing about using salvaged timber is that it you can tell people that you're being a responsible enthusiast by using salvaged wood, and pretend that some of the stuff-ups are actually the fault of the guy who used the wood in the 1930s. That's my excuse!