As stated in my profile I will be selling models and such elsewhere. HP and LP and so on I try to make good HQ models somewhat cheap, usually game-ready. If you like what you see it is here.
https://www.cgtrader.com/3d-models/industrial/industrial-machine/the-gulpster
I plan to expand to more than cgtrader but for now this will work.
Based around the idea of a futuristic prison with a dash of extra tyranny. You will notice this is sort of based around a boring machine. This huge guy, if put to scale, grabs ahold of asteroids, then drills a nice hole to settle in. Then the prisoners inside suit up and get to mining it. The pilot seat is built entirely for discomfort. Also a bit drug-based to keep the pilot going for a few days straight. Not the most ethical prison out there, but hey, who said that was the goal? Once the pilot reaches his limit, he is swapped out for another prisoner who can pilot this thing. They are few and far between, hence the whole drugging thing. As you can tell, this thing is battle-tested, more like cheap skate inclined. The most important thing is often kept up-to-date and clean, i.e., the head, while the paint and panels that keep radioactivity out and so on are ignored, at least only when the prisoners are getting a microdose or a dozen. Cheap, efficient, and without care for prisoner well-being. To be fair, most prisoners here have a life sentence, and since this is the future, it could be 200 years easily on the low end, but do not worry; if you have money and know how to bribe properly, you would never end up on such a monstrosity.