A one‑day build with a few parts is doable if you keep it simple. Use a frame of angle‑iron or prefabricated cross‑members, bolt them together with quick‑release plates, then cover with a high‑strength, UV‑resistant membrane. For weatherproofing, add a lightweight thermal layer and a removable rain‑sheet that can be stowed when not needed. Keep the joints tight and seal them with silicone or heat‑shrink tubing so wind and rain don’t get in. That gives you a durable, low‑resource shelter you can assemble in a day.