Interesting, I have never seen a console like that on a tiller SIB. Pretty cool.
My friend that is a pro at plastics, showed me many tricks of the trade as we built my Mini-Me tower to that one. Starting with a CAD drawing from my idea, taking that to a CNC machine, followed by a lot of hours getting it routed and glued. Then I spent many more hours finishing putting it together. I only have a Odyssey PC925 AGM battery not two batteries, but don't see the need for duals, as I have pull start (I converted mine to electric start). The battery is quickly disconnected with an Anderson Connector. There are 4 connections total, in order to remove the console from the boat (12 volt battery leads, running light/bilge pump connector, VHF antenna, and the Sonar lead). My goals are probably a lot different then the boat shown above. I wanted to be able to remove everything possible from the boat in less than two minutes (For beach recovery on wheels, so light weight is needed). Hence the handle on my electronics console to be able to carry it up the beach easily (It weighs 36 lbs). Plus mine is a cheap beater boat for fun, and floor space is for scuba tanks. I also wanted someone sitting across from me to be able to navigate and watch the contours for locating dive sites (With lots of fish to look at hopefully), so my sonar/chartplotter swivels. I have a piece of HDPE for building another mounting base, but need to find the time to do so. Then the orange Save-A-Boat-Dive kit will be securely mounted in case of flipping the boat.
My boat is an old piece of junk compared to the boat above, but it does get us out on the water. We went for a hike at Angel Island this afternoon in the middle of the San Francisco Bay.