It's been a decade or two since I played with these so , in the past you needed to find around 9 v at the coil to protect them from arching... sorry I meant the distributor..
You got the idea vent plate on engine needs to be damn close to the bottom of hull. Obviously we don't know what that is but your red sharpie markers will tell you...
I would first cut all the damaged glass back then champer the area so you can build back with csm and cloth. If you can access the interior do the same..
Maybe the casual boater just needs a computer to enjoy boating..I like my old boat more every day..I really couldn't find any love in the new boats..Too old!