New Wiring Diagram to Najad 34

[Golden Orchid]

I've read through a lot of post here and elsewhere about how to set up a new 12V system.

I want to keep it as simple as possible. Underneath is a suggestion on how to do it. The way I plan to charge the system is to the through the house bank (named 1 and 2) and with an ACR og Echo Charger to the starter bank (named 3).

The problem I keep running in to is a way to use the both banks to use to start on the engine. Do I do this with a 12B switch?

How do the system look in general?

Be forewarned, my electrics skills is quite low. And so is my english.

Thanks in advance,
Jonatan from Norway