This is a complete set that allows you to print up a "Mech Arena" inspired by the Steiner Stadium map from the Battletech Essential box set.

The retracting walls are separate from their hex base so you can remove them when needed. There is a slot they rest in. When removed the slot looks like the top of the walls. Each mech arena set will include full amount of pieces (hexes, walls, arena walls) to make the above pictured full size arena. 

Some of the walls that are large and solid have been broken up for this set to easily be traveled with and brought to tournaments / homes for battle.

I included a color screenshot of the underside of the board in the pics above. This shows how I set up the board and you can see what size tiles went where. The yellow parts are the frame, the green are the walls and the wall base tiles, and the gray are the hex tiles.

The frame have holes on the underside for 3mm x 8mm disk magnets to secure this to a magnetic white board or metal tabletop. 

The hex base is designed to have 3mm ball magnets inserted into it if you wish to use with Maghex Tile Terrain, if you have any questions on assembly that you can't figure out please feel free to message!