Gena had noticed some stiffer panel when we were choosing ours at the store. It appeared to be the same panel glued on to some of that corrugated plastic sheet. We already have some of that from when we used it for window covers and possibly will use for "anti-poke" protection beneath the floor in larger areas.

We just glued it to the panel using PL-400 ( top photo ) and slapped them together to dry for a while.

Two of these can be seen in the photo, ( right ) one leading aft, the other outside. I'm glad we stuck with the same diameter corners because it wouldn't look right if they were different. Note the seam is under the companionway. Most of the seams are in less exposed areas where the won't be noticable. The ladder will hide this one. The joiner strip looks fine but does break it up in an unusual place. Other joins are behind stowage areas, under frames, and along under shelves.

We will suggest this panel to anyone building a boat interior. It's really tough, curves easily, has a nice random appearing texture, (although if you look down it the right way you can see a pattern!) and most important is very water resistant. The down side is it is floppy over flat areas and needs to be supported, doesn't have the warmth of wood, and doesn't come in many colors.(White, beige)