Has Dynon considered offering the AutoPilot and Knob Control panels so they fit in a standard 3 1/4" round hole? Maybe even offer the Com radio control head so it can fit in the 6.25" standard avionics rack.
This might have been the first request I've seen for the form factor (for those parts), so I can't say it's been on our radar. With homebuilt aircraft, folks are often building from scratch, so fitting that form factor hasn't been a common request. But definitely not a bad thought.