Two years ago I tackled this project on my 1999 Catalina 36 MkII. My current sole panels were still intact so I was able to use them as templates. I purchased 3/8 marine ply with T&H veneer from PanelWorld. It took 2 @ 4x8ft sheets laid out carefully to just fit all pieces. Used both a skill saw and saber saw for the cuts. Then used Total Boat sealer (3 coats, especially heavy on edges) & Total Boat Varnish (amber color) rolled on with small foam roller. This product dries quickly, 15 minutes, so easy to put on multiple coats fast. Lighted sanded every third coat. Lint cloth before each coat. Believe I put on 10 coats. This product also has very low VOC so almost no smell so I was able to work inside with very little dust. (Note - the sealer stinks, so work with this one in a well ventilated area). Due to the templates, panels came out perfect, even the screw holes matched up, so the install was quick. Came out beautiful as seen in the attached picture.