Dropzone Commander Building Corner

### Update
please see my wrap-around sidewalk for buildings here: https://www.thingiverse.com/thing:2042493
or the sidewalk + destroyed building rubble here: https://www.thingiverse.com/thing:2156026

### If you have a small build platform (like I did when I first made this) then read on...

Building corner in the form of a sidewalk for the buildings in Dropzone Commander.

Update: a gap on one side to allow for the corners where the buildings are joined together and the paper is double-thick.
Update 2: tweaking the gap to better fit on all corners

The buildings in DzC are nice, but as they're made out of folded cardboard, they're difficult to get 100% square and they tend to move around a bit on the board. These sidewalk additions help to ensure each corner is square and add a little weight to each building to help prevent them from moving.
For the standard 10 buildings in the starter kit, you'll need to print 40 of these.

If you want an all-around sidewalk, you can a