on that boat i'd still try to keep the batteries forward. there should be room outside the stringers in teh genny room.
again, it all depends on what was done to the boat over the years. many older hatts have two battery banks, one per engine and one of the bank is used for house loads. Keep it that way and add an inverter bank.
personally i like golf cart batteries (6v) as they are designed for deep cycling and they are cheap. On the downside, you have to add water every 1 to 2 month so they need to be easy to reach.
the ideal set up is to be able to last about 20 to 24 hours on batteries (house and inverter) before you need to start the gennies. on my 53, that means 8 golf cart batteries, about 880AH at 12V, most of that is used up by the 18 cu ft fridge / freezer. on the 70 footer that i run, I installed 16 golf cart batteries (880AH total alothough at 24 volts) and we also get 18 to 20 hours running 3 sets of sub zero fridge and freezer, one fridge ice maker and entertainment center.
obviously you can't use the total capacity, only 40 to 50%.
so depending on your need, you will need to generate 300 to 500AH a day between solar and wind. doable but not cheap... of course on hot nights away from teh dock you will need to run the genset for air cons.
on the plus side, those older hatts have good ventilation so during the day with the doors and windows open you dont need AC when on the hook except on calm days (rare here in so Fl)