>>5425924They're Grey Knights terminators.
Those aren't ladders, but rather loincloths/banners/inscriptions to ward off daemons or to acquire the Emperor's blessing.
That said, being one of the guys who builds waifus I'd say that everyone being into them is definitely an overstatement. However, I'll give reverse-engineering one a shot. It seems like the leg articulation is really limited, though, and at the same time it seems like many of the important parts are quite clearly visible in the pictures you've posted. If you were to try reverse engineering one yourself or at least building something very similar it probably wouldn't be too hard a job.
