Wingspan Dicetower flat overworked!

An overworked version of the Wingspan Dice Tower - flat version.

Improvements are:
1. Every Panel has a flat side to print on and a thickness of 2mm (improvement to the original flat version)
2. Flat sides are on hidden/inner sides (original flat version has a few panels mixed up, especially the "back dice" panel and the "bottom inside dice" panel
3. Fix of the roof panel + 2 Versions to print (1 for standing print, 1 flat version which has to be glued together). I fixed the inner grooves and enlarged them by a little to better fit in the left and right panel. Should be a little more stable...