I had been thinking that the finishing of the internal lining would not happen for several years.
However, our WWOOFers Laurent and Deborah were amenable to working on filling and sanding back the screw heads.
They did a very neat and efficient job - making two passes at filling and sanding during the day.
They also got stuck in to a number of other jobs - raking up leaves and bagging them, cutting up tree prunings with a chain saw, sorting out the recyclables, and cleaning up the excess soil in the work shop area.
A very productive (and long) day