I decided to build the super-quiet doghouse for the genset, it's going to be completely enclosed with sound deadening plywood and sound insulating foam, rubber foot isolators and an baffled air intake and separate air exhaust with a remote radiator and muffler. Supposedly this should make it near impossible to hear - the doghouse isn't complete and it's already fairly quiet.

I'll be putting up the full plans soon, it actually fits quite snug using exactly the space of one side of the cargo bay and the space under the center channel. The other side of the bay is just what I needed for my massive battery bank.