I didn't find the clearly illustrated $10 plans hard to build two folding coroplast kayaks, 7 foot, 8 lbs with 185 lb capacity each, tied together for gear/supplies and me with reusable zip ties difficult. The 16 lb, 8 foot folding coroplast teepee wasn't hard either with duct tape & tent stacks. Used a utility knife, aluminum yard stick, electric drill and a couple of metal drill bites for a whole lot of fun for the next several years.
Designing a simple solar heater for my pop up, hopefully insulated, tent. So I'll have some fun with my solar projects, woodgas gasification stove interests & solar powered swamp cooler while cycle touring with my folded rig this year. Also looking at testing DIY insect repellent from the 12 or 13th century when the plague hit.