Glad this is heading back to the OP question!
So I include my latest electrical power architecture scheme. My goal is to be as SIMPLE as possible, with the least number of switches/relays/components. Not a lot of detail here, just concept.
This also stays in line with emergency procedures, as in masters off will not kill the engine. (hopefully we are still flying).
This is actually very close to MOD 2 of the original post. I think it has a lot of merit. One bugaboo I have is finding milspec highly rated switches to control the engine bus. Worst case scenario would be around 20amps, would like to be able to de-rate the switch a bit. (and locking would be very preferred). Any ideas?
Now I will sit back and wait to be flogged.....