A large Single unit base consisting of a small power room in center surrounded by four large rooms. One room has racks for bunk style bed units. Double thick steel walls and lots of glass makes this base rather expensive but it is durable and will hold all the current machines 12 beds with room to spare if Pathea adds more machines. The base is modular so you can place more units door to door for a truly monstrous complex. Stairs up to the roof can be a bit tricky to place. I put iron blocks down to show where the feet go, one set needs to be set down into the floor by a step. I found it easiest to delete one row of iron blocks on the 1st tier place the stair and put the blocks back.