Oh yeah, I forgot about my chickens, we use rain water for them too, sometimes..but not always...depending on the time of the year? I like your gravity system...
Operation “Roof the Rabbitry” has finally reached the top of the priority list!
We started work on it last weekend by taking apart some old rafters that we bought at an auction for $1. We’ll roof it with some sheet metal that we also got cheap at an auction
Hoping to get it done by Wednesday, when it is supposed to rain. We’ll see...
On a wooden hinged frame, try corrugated plastic roofing. Sufficient lightness can still work as a door or hatch. Use standard roofing material (tin or asphalt shingles) and outdoor-rated plywood with a waterproof layer underneath, as others suggested. It only needs to provide structure for the actual roofing material from the Indianapolis roof company; you could probably get by with pressure-treated or cedar planks as well. Pressure-treated plywood and paint will suffice, at the very least, for a few years. It's common for people to sell or give away leftover project materials.