It immediately reminded me of those "travel tunnels" or whatever they're called*, from the Terry Goodkind book series. Probably too out-of-universe for your project, and you'd need at least another one -- or several -- for it to work.
*It's been so long, I can't remember. I read the first three or so, but got tired of the constant sadism. I had a similar experience with the Gor series, way back in the late 60's. There, of course, it took the form of the most extreme misogynistic BDSM. Wasn't too bad in the first two books, but I started the third, and said "fuck this". The only books I can recall ever throwing in the bin, rather than letting them infect innocent minds.
Hey-- it looks great, BTW; if you hadn't said otherwise, I would have believed it was from the original toy line.