2006 Tige 24Ve questions?

Any Tige owners out there I'm helping a friend do a system in his 24Ve and we're adding a couple batteries, tower lights, and full stereo system. The current battery is in one of the rear storage lockers. We're looking to relocate the batteries into the observers storage compartment to give room for surf sacs in the lockers. I'm adding a Blue Sea add a battery kit to it with the selector switch and acr. I don't want to re-invent the wheel here and looking for some ideas or what you've done.

Also looking for any amp rack, sub, and tower wiring ideas for speakers and lights.