You're not messing around! Done and done!
I realized I have
even more gross hack DIY projects. I really need to stop doing those.
Right now my heating system is forced hot air, provided by a home-made air handler. I used surplus truck A/C condensors and had a local place bend the housing sheet metal (my brake wasn't wide enough). Unfortunately, I used a very thin gauge, so when the fan kicks on it inflates like a balloon, causing one side to bulge out making a dimpling noise! I solved it by putting a ratchet strap around the whole thing and wedging a 2x6 under it on that side. I had planned to solve it more elegantly, but since I'm planning to sell soon the whole thing's being chucked in favor of an hydronic system, I don't need to bother.
I also made a shed designed specifically for my trailer. It's pretty narrow, so the entire front opens (there's a faux smaller door). That required a bit of structural reinforcement. For the rear and sides I used all the scrap metal roofing panels that the ones for my roof were shipped inbetween (scrap ones protected the painted ones). The ramp is a double fold design and because of the slight hill there I needed to nail on some metal lathe to give traction when my ride mower's wheels get wet (otherwise it just spins). It's about 500' from my house (near a second driveway), so there's no power and I installed a translucent roof panel to give some light.
I also cooked up a DIY fan stand last summer since I had a bunch of tripods kicking around. It's not as unstable as it looks.
Other than that, I tried to use cardboard shipping boxes as heat ducts. The big sizes in metal were quite expensive, and 12x12x48 boxes were cheap. I had too much trouble joining them and was worried about resale so I abandoned the idea, but I still think it could be made to work. Finally, I use an old webcam to check the oil level in my crawlspace tank. Just have a clear tube hooked to a tee fitting coming off the tank and the camera is trained on it. To use it I plug in cord that turns it and a light on and then plug it into my TV. I tried to use pressure changes in air trapped in the tube to gauge tank level, but it seemed to vary an awful lot so I abandoned it. Plan to cook up a float based one (ten floats, ten switches, ten segment LED) later. OK, that ought to be ALL my silly projects. For now.