Join Date: Feb 2000
Location: Annapolis, Md
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It is hard to say without seeing the boat, but unless there is a king post right under the mast, I would suspect that you would need to remove the mast and also at the very least release the shroud tension. If you make a template before you removing anything then perhaps you can try removing the bulkhead and see if it distorts. I would only do this if the yard can remove your mast without moving the boat.
The big thing is that you do not want to have anything distort the hull in a way that might get locked into the shape of the boat by the new bulkhead.