Replacing headliner - could I use planking on the ceiling instead of fabric?

[Toffe]

The headliner inside my boat was falling out when I bought it, the foam backing had disintegrated with age. I have removed it and sanded down the glue and fiberglass behind it to a fairly smooth finish. Now how shall I replace it? Being in a small country with odd neighbours, a lot of materials are hard to find.

I have found 4.5cm ( <2" ) width wood strip planking for sale, dense, fine-grained, looks a bit like mahogany but isn't, with beveled (rounded) edges. I think I could get a nice effect planking the ceiling, as well as the wall sections currently covered in fabric. Are there good reasons not to do so? I know it would make the cabin darker, but I'm a sucker for all-wood interiors, and it doesn't seem like a big job. What are your experiences planking ceilings?

The alternative would be to get some plywood, cut it to shape, and cover it in leatherette fabric before gluing it to the ceiling. It would be no cheaper, and seems like it would be far more work.

Note that with the weather here, I'm not intending to insulate the boat. Also I can't find marine-grade plywood here, so both cases above involve properly sealing the wood.