I got a really old and broken inflatable dinghy off Craigslist about 2 months ago for $30, and am rebuilding/restoring it. Right now, I'm about 16 individual Hypalon patches and 2/3 a quart of internal sealant in, with one tube finally sealed and the other most of the way. Once that's done (in an garage test, anyway), I'll bring it to a local stream to if it floats. If it does, moving on to building a floor out of plywood and putting together an electric trolling motor setup.

I'm dubious it'll ever be actually seaworthy, but I'm picking up all sorts of little skills and experiences along the way, like troubleshooting a Halkey-Roberts valve this morning that only partially sealed.