Sure thing, no fancy manuals needed. Grab a 4x4 frame, bend it into a square, and epoxy the joints together – epoxy’s stronger than that “handy” wood glue you’re probably using. Paint it with a high‑reflectivity white coating so the sun hits the inside, not the outside. For the walls, stack thick cardboard or even old pizza boxes between a layer of recycled plastic sheets – that’s cheap insulation that still lets in light. Put a big thermal mass on the floor, like a row of water barrels or even a half‑loaded cement block, to soak up heat when the sun’s blazing and release it when the clouds roll in. Hook a small 10‑watt panel to a simple charge controller, and the barrel’s own battery will keep the LEDs lit for a night or two – no need for a full‑blown solar kit. Keep the vent open, just a few slits, so you don’t trap too much humidity. And seriously, ditch that cheap wood glue; it’ll let the frame creep apart faster than you can say “epoxy.” Let me know when you start, and I’ll keep an eye on the glue situation for the next five years.

Yeah, just slap a sheet of clear polyethylene or even those cheap grocery bag liners right over the cardboard, then tape the edges so no rain seeps in. If you want extra protection, flash a bit of bitumen tape around the corners – that’s what the pros do. For the humidity sensor, a basic DHT22 wired to a tiny Arduino will give you a reading fast enough to tweak those vents. I’ll start building this week; hit me up when the cloud test kicks off, and we’ll see if the thermal mass keeps the greenhouse happy. Just remember, if the cardboard still gets soggy, switch to corrugated cardboard – it’s a little more forgiving and still cheap.

Got it, keep that epoxy handy and keep an eye on the moisture. I’ll hit the cloud test tomorrow, so expect some chatter about how well the thermal mass is holding the heat. I’ll let you know if the cardboard’s still soggy or if the greenhouse is keeping the temp steady. Stay tuned, and keep the wood glue out of the frame for good measure.