I recently purchased a Seaworthy RIS Inflatable dinghy. Like me, it's quite old, and after some tinkering, it holds air quite well. It came with everything but an owner's manual. The 4 floor boards are made of 1/2-inch thick marine plywood, and connected together with specially made, hard-rubber joint connectors. IN addition there are four side support bars made of wood that fit beneath the floor boards and into slots.
Having never owned an inflatable dinghy before the first thing I learned is that the floor boards must be installed prior to inflating. What I could not figure out was how in the Hell do thise side support boards get inserted.
Unfortunately the boat didn't come with an owner's manual--just the first and last page of the 10-page book.
The boat measures about 9-5 feet from the tip of the stern to the tip of the bow. It apparently was sold by West Marine, but discontinued several years ago, possibly in 2005. The guys at the local West Marine store said they have no paperwork on them at all, but recall the brand name. I'm guessing the boat is probably at least 12 years old.
The boat is extremely well built, has an inflatable interior keel, single board seat, oar locks, and two-chambered. I searched the internet for hours for an owner's manual, but to no avail.