I had an outboard on my sailboat and painted it bright yellow so the drunks could see it when using the boarding ladder.. I guess it reduced injuries...
I agree with bullet hole theory but no matter what caused it unfortunately it's in a tough area for repair..5200 for sealer and a shaped aluminum patch riveted on is the best I can think of..
AD you seem to want a kit that actually works. I don't think you can find a markeded package and your piece work with a basic store bought is the way to go..
You can slow the rot around the hole if you chuck up an allen wrench in a drill that you can hang on to and chew the wood back between the glass and then fill it with a PB..