My priorities are different little bit. I am flying with right hand and trying to keep right side of the panel informational only. Everything with switches and buttons will go to the left. But nothing is set in stone of course. There's a good chance I will be changing everything 10 times before I settle.When I built my panel one goal I was after was to try to separate flight information (instruments) from engine information. On the left side I have my LRI (Lift Reserve Indicator), slip/skid ball, and MGL Flight-2 instrument. The right side has my MGL Engine-1 and tach. Radio is on that side also and it would have been better to be a little closer but it's a "cozy" cockpit so not too difficult to deal with.
Also used switch covers of different colors to separate similar items i.e. mag switches, lights, avionics, etc. and safety bars that prevent the accidental shutting off of switches and also allows a "safety pin" to be inserted to prevent accidents at fly-ins from curious folks,
But over time things get added and/or moved. I'm trying now to figure where the auto pilot will be mounted ... most likely under the bottom in the center. Here's a not so recent photo (before the transponder was added under the panel beneath the slip/skid ball):
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