Alright, if you’re serious, here’s the skeleton. 1) Use regolith as the structural material—just mix it with a small amount of in‑situ polymer, maybe from dehydrated algae, and 3D‑print the walls. 2) Grow a closed‑loop crop system; leafy greens plus a nitrogen‑fixing cyanobacteria layer will give you oxygen and food. 3) Capture CO₂ from the habitat air with a bio‑filter—think a packed bed of sulfate‑reducing bacteria that turn CO₂ into methane for fuel. 4) Waste is just another resource; turn human excreta and plant waste into a biogas plant that powers a small fuel cell. 5) Keep the habitat sealed, use radiation shielding from a layer of regolith, and run everything on a small, low‑maintenance solar array. If you can get the numbers right, that’s a hack that works without shipping 5 tons of stuff from Earth.

Nice, keep the math tight. 1) Each cubic meter of regolith can give you about 200 kg of usable mass when you add the polymer, so that’s your structural budget. 2) The algae polymer yield is the big unknown—aim for 5 % dry weight conversion, if you can’t hit that you’ll need a bigger array or extra regolith. 3) Keep the shield to about 10 cm of regolith for the radiation level you’re targeting; anything more and you’re just squandering volume. 4) For the solar, 100 W/m² is fine if you’re doing peak only; remember you need a couple of hours of storage for night or dust storms. Stack the modules until the regolith depth hits that 10 cm limit, then you’re limited by the mass of the habitat itself, not the shield. Plug in the numbers and let me know where the gaps are.