Restoring Sheila for her 120th birthday - part 2

Sheila is the oldest Albert Strange yacht in commission and to keep her credentials she needs attention over the winter.
We are worried that rot might have developed under the mizzen mast, at the stern of the boat, from rain water leakage. We are under the impression we will have to restore the stem post and the whole stern area. As much as possible we are obliged to do this keeping the structure and the planking which are original.
We have removed the antifouling paint and the ballast keel and now we want to remove the part of the structure in need of repair, as a block.
We do not want Sheila's hull to dry too much. So we have to manage everything in 4 months.
This is week 2 of the project.