>>2012205>but in short>contIt's pretty much just a sturdy enough pole to sit on, supported about at knee height, with preferrably a hole dug underneath. For a years worth of shitting, choose a spot where you can move the setup around a bit, shit until hole is full, shovel over, mark, move.
>solar panels for energyThis is where I would preferrably pour your concrete slab budget, I've used aggregators in the military, but a good solar panel you can later on just use to partially power your house. Some dinky 30 euro aliexpress piece of crap is just going to be useless for you later on.
>Isn't it going to be way too hot for either a tent or a wooden shack?Now I'd personally go with canvas in your shoes, as heat management is going to be a bigger issue for you than cold management and canvas retains less heat and breathers better. Our summers are way less hot than yours, but atleast personally it's always been more comfortable during hot days inside a tent than outside, as we tend to set it up somewhere shady. and those military tents naturally circulate air, pushing it out the top, and taking in cooler air from the doorway. Might be a problem depending on your geography though. If you got questions, ask away.