we had ours made at a boatyard on Loch Lomond while on holiday, the old floor gave up, so while the weather was rubbish for a couple of days they sorted a piece of marine ply, cut it to size, gave it a couple of coats of varnish & fitted it for us. It was brilliant, made the rest of the holiday without any more problems!! We even went right up to the end of the Loch one day, no problems
good luck with sorting yours