Not sure why instrument back-lighting is an issue since you are not using or looking at the instruments without the moror running and the alternator would be charging the battery. That said, the instrument back lighting is in the actual instrument, either integrated or by using a bulb installed in a removable socket on the back of the instrument.
As far as the dash, there are places that will use your existing dash panel and duplicate it in some type of spaceage material, Lexan, acrylic, carbon fiber, aluminum, etc., and it looks really nice. Google is your best friend for that. You might also browse the forums on "The Hull Truth". Lots of threads there by guys who have done refurbs and restorations. A blank panel face that would allow you to replace and locate instruments where you wanted them would be a nice upgrade.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner