I bought the Blue Sea kit as well as a 12-position fuse panel, and my intention was to do exactly what you reference.....put the house accessories (lights, gauges, stereo, amp, etc.) onto a deep-cycle battery and only have the starting battery for starting the engines. I'm in the process of deciding if I'm going to sell the boat or keep it another season. If I decide to keep it, I'll install the kit and move the electronics as described. If you move the entire accessory fuse block onto the new house battery, it shouldn't be much more than connecting the positive cable from the fuse block to the Blue Sea switch on the house battery terminal.