Here I took the engines off and the flotation out (nearly EVERYTHING out as it turned happened) in order to let Universal Hovercraft rework the bottom of the craft. Initially I was going to do the work, but by the time it was all done I ran out of time and patience and so paid them to do it.

That was a remarkably good idea, since they did a much better job than i would have.

The white thing in the cockpit that looks like a floor lamp base is my steering gear, made of pvc. not a bad experiment, but it's very heavy.
Here's a look at the front of the lift duct. The lower motor mount (the right motor mount if the craft were rightside up) had issues. The mount is a piece of 3/4 green treat plywood that was laying around. i foamed it in to a slot in the duct so it was level. I fit the motor mount in there just like i wanted it, engine and fan and everything. I drilled into the wood and added t nuts. Then I foamed the rest of the space full and glassed it over. Years later, the t nuts on that side twisted out because the bolts were rusted on. So I had to dig in there and unscrew the bolts.
This is the piece of my craft that wound up on the parking lot at Muscoda this year.
I tried to quantify exactly how bad the bottom was, but I didn't come close. It took about 2 minutes for a foot of water to get inside my craft if the lift died. The foam flotation took over at that point, but there were a LOT of holes in the hull.