I don't see problem with stairs per se. You can move the rat above ground and over stairs. It has psi vision of 1-2, but it's "infinite" in z-direction. Meaning, rat can see anything under or above it. Used together with motion scanner, it makes most mutli-levels layouts, such as HQs, stairs, bases, this one, etc., really easy.
Sadly, mechanisms / robots are invisible to psi, and that's when it becomes find-last-bot circus. Most annoying map in the game, given the robotic faction, that is also fairly annoying.