Well, that's the name. It sleeps one, with not much room for anything else. It's also shaped a bit like a coffin. I haven't used my carpentry skills for a long time, so it is what it is.
Here's the starting point. A PWC trailer from CraigsList for $160:
Stripped off the boards, extraneous hardware, and decals, then primed:
Bottom side got cleaned and primed as well: