Fantastic, Alex! Great to see so much progress.
A couple of thoughts on your panel. You could eliminate three switches:
1. Two could go by using a DPDT OFF-ON-ON progressive transfer switch (Carling 2GG51-73 / B&C S700-2-11) in place of two separate SPST switches.
- One to control battery and alternator field (down = both OFF, middle = battery ON, up = battery and alternator ON).
- Another to control nav/pos and strobe lights (down = OFF, middle = nav/pos ON, up = nav/pos and strobe ON).
- If you have two landing lights, one aimed for landing and one aimed for taxi, you could control them the same way (OFF, taxi, taxi+landing).
2. The third switch that could go is for the panel lights, if you used a dimmer potentiometer with a built-in switch, either rotary (twist to dimmest setting, then twist further to click off) or push on/push off.
Also, just a thought... instrument upgrades/additions in the future might be difficult if switches occupy the middle of the panel.