Crickets?
https://www.steelsoldiers.com/threads/mep803-power-conection.201322/
Looks to me like you started a good conversation and dropped out. What kind of ideas are you looking for? Scoobyshep indicated.... " There are 2 real flavors here, you can install a transfer switch before the panel or an interlock in the panel. For the interlock to be an option you need a main breaker in that panel. "
I've got a panel interlock and back feed the box through a 70amp circuit breaker. Wire sized for 52 amp (240 volt) for my 803. I'm manual: lights go out, I give Dominion Power several hours to get it back on, then I start dragging cable and flipping breakers off. From my 803 I feed a spider box (for my neighbors) and then to my 70amp breaker. Generator on and I'm back to flipping breakers...this time on. Plug in the neighbors and everyone is happy.
A search of the SS site will give you a lot of ideas for wiring your generator to your house, too.
Here's a shot of the cable and connector I use....