Agree with the IFR mgmt comment. I can't claim too much originality. I've stared at large military, airline and corporate panels for many years. Compared panels designed in the 60's to modern ones. Tried to incorporate features that the professional engineers adapted. Most notably: controls (including switches and knobs) grouped physically and visually by system (engine, fuel, electrical, environmental, lighting, autopilot, etc), use of automation to declutter (remote avionics, minimize switches), ergonomic placement considering eye position and hand movement during critical tasks, electrical system design to remove the clutter of c/b's (fault tolerant system and operating philosophy = remote fuses that are not replaced during flight was my choice).
Great to know some of the design decisions of the pros line up with thoughts I've had, without diligently doing the research as you have. Planning a number of things you point out.
Minimization/automation/decluttering/controls: dual g3x touch, gtn 650xi nav/com 1, remote nav/com 2, remote xpndr gtx45r, remote audio panel gma245r, gmc 507, g5. My only physical switches are bat 1, alt 1, and alt 2 masters, boost pump beside throttle, and an ACS keyed ignition switch for the emag/mag/start. Lights, cabin climate controls, and pitot heat switches are getting put on a Nextion touchscreen with page groupings, feeding ground enabled switch inputs to the VP-X, GAD27 and flyLEDs, backed up by on-PFD control of the VP-X switching, with the VP-X itself backed up by VP-X backup method B for the essentials.
Ergonomics/eye hand movements: g3x pfd and mfd are positioned side by side on the pilot side. Touchscreen, GTN and autopilot controller below those in a horizontal configuration, working to mimic the G2000. Audio panel, transponder and nav/com tuning on the PFD/MFD, autopilot on the GMC, flight plan editing on the GTN. I might give more thought towards how you've placed your mag switches very close to throttle, which has value on doing flow work on abnormal and emergency checklists.
Electrical system: Leveraging the VP-X with dual battery and dual alternator. All of the essentials can be powered by one or both of the alternators or one or both of the batteries. With our without the VP-X in the loop using backup method B that backs up the VP-X electronic circuit breakers with fuses off the batteries.