This allows mounting a Virpil Mongoose CM2 base to a piece of upright 40x40 profile.

The profile is offset enough to connect the 5 pin din connector, but not the AUX connector which is directly behind the profile. There is also a USB cable support.

I printed with 2mm top and bottom and 6 perimeter walls with 15% infill. It takes a while to print, but is very solid. PLA is working well for me so far.

Hardware:

4 x M5x30mm socket head bolts ( attach to the Virpil base )
1 x M8x16mm socket head bolt ( bolts straight down into 40 profile threaded hole )
4 x M8x16 bevel head bolts ( attach to the sides of the profile)
4 x M8 T-nuts

The top M8 bolt requires that you tap threads into the end hole of the 40x40 profile.