Nick by now you will have realised the problems ahead of you. If your FB "dries out" to some extent after being back in the water for couple of weeks you may not have to replace your fittings. My FB is carvel and leaked like a "seive" for several days but we stayed and "manned"the pumps. She had been out of the water for 5yrs? But I have a friend who has a clinker FB and if left unattendended it used to leak badly ...but now before going back into the water he uses a flexable filler. After a couple of days he goes round inside wiping off the excess filler. Works well for him. Good luck with your FB.
Mike