WELL, THERE ARE EXPERIENCED FOLK AT THIS SORT OF HULL
, but I'm not one of them.
My understanding is that the planks are the least of your problems.
1. If the frames and cross beams aren't sound then you're in trouble
2. If the decking is leaking rain water
then the cross beams and frames will suffer
3. Any IRON (nails screws bolts) will have to be replaced with carefully chosen compatible ones.
4. You'll need to shift any ballast to make a full and detailed inspection
of the bottom from inside.
If that all seems reasonable then get it wet from the inside and keep it wet (check if salt
or tap/rain water
is right). Apparently this will stop it sinking quickly when it goes in the water, it will only sink slowly which isn't so bad!
Honestly:- ask GordMay for the right book on the subject. You will need to know what timber was used for all the different parts
to get the right treatment for each type of timber in each location and how, and with what, they were joined together.
My neighbour has been rebuilding a '30's lifeboat, now a houseboat, for three years. The amount of work he has had to put in is incredible. He has all the skills too but still has to redo things because they didn't work out right.