This uses the DDD Printable Wall Control System (github) to mount the saw. 

I've designed this using the Makita XVJ01, but any jigsaw with a base plate smaller than 80mm wide and 20mm thick should work.

Use a good percentage infill to keep this rigid, at least 40%.

For the sidepieces, I used the included 1x5 side brackets. Use these 4x10x8mm pins to attach to the mount.

I'd recommend using the locking spacers facing the wall surface, I used three of the 1x4 size. This can be used to lock in the mount using the threaded pin.