Worked on the hovercraft some more yesterday. Got the engine mount figured out ... it's not perfect, but it looks like it'll work pretty well. We also did a little work on the engine cover. It was a moderately productive afternoon, considering we only had a few hours to spend on it. I think in a couple of weeks, we may have this thing hovering again!
Before next weekend I'm going to do some cleanup tasks on it; sanding drips in the paint and rasping off a particularly ugly jigsaw cut we made last night so that the engine cover would fit right. Onward!