Hello Oliver,Tobias,
Thanks for the info. I was aware of the cutout for the pumps. I was planning on waiting until I’ve constructed the pump house to cut the planks in order to make sure the cutout is correctly sized.
I’ve looked through Adrien’s book and G.D.’s drawing but did not find any reference to the ledge supports against the keelson. It does makes sense to install them but I’m curious where you got the information for them.
Thanks again for your continued help and expertise.
of course I can give you the information, it's not a well-kept secret.
You will find them very well hidden in the plan and also in Adrian's book.
Here are a few pictures with the hint that they exist.