GBS-8200 Case - Split for MPSM V2

I took Maxik234's awesome original design and split the top and bottom into four separate parts that each fit on the print bed of a Monoprce Select Mini or other printer with a similarly sized bed (120x120x120).
I split the parts in different places so that the seam wouldn't overlap in the assembled case and make it weaker. I also added tabs to the split parts to make a tighter fit when put together as well as to restore lost rigidity.

The project isn't perfect and I cut the letters apart,