Using the D3P riser on my K2 plus i'm building a multiboard holder for additional storage of various tools.
In my case the backside grids are 2 11x11 and the front towards the door are 9x11.
I also have a shelf it sits on so mine is a taller than a standard K2 plus.
Just figured easy generation of multiboard octagon for those that wish to add this.
Pictures to follow when done.