Hot again today but below 30C so I was able to repair the steel frame of the forward-facing, bulkhead-mounted large entance vestibule window by welding in a new strip along the bottom. This had rotted due to its contact with the aluminium beading that runs horizontally below the two windows on the front bulkhead. Hopefully I shall be able finish preparing the window and paint it tomorrow.
Removed two more N/S windows today, w2 is very badly rotted and the frame will have to be largely replaced. The first one I removed, w4, is by far the best so far and will serve as a pattern as it needs the least work. One more remains to be removed then I can start on repairing the woodwork.