Finger and Toe has their new Core terrain piece pdf available as part of their XRay Prime line.
From the release:
Finger and Toe Models announces release of the 3 3/4″ action figure-scaled XRay-Prime. The set consists of walls, floors, windows, doors, and accessories to make multi-level sets for your encounters.
Build them with re-positionable glue or tape so you strike one set, rebuild, and continue the adventure in another location. It’s easy: glue the one to six inch walls to base plates, slip and window or door over the walls, then cover the wall joints with either 2D or 3D joint covers. Add equipment, work stations, and you’re ready.
Expand a scene with other Finger and Toe action figure-scaled sets such as L.I.A.M.