wet brush is good tip--duh!!--that how our plaster got a nice smooth finish on the ceiling and walls.
My only concern in the whole excercise would be ....
Is there not a way in which your fine Iron Duke can be protected from dust/ new modelling project debris/flying matter...?
Perhaps hang a polythene screen from the ceiling-that way avoiding any potential damage to rig....
This is coming of course from a dust/glass case prima dona..!!
ID makes a nice back-drop for the in-progress photos though!!
Great stuff!
Cheers
JIM BAUMANN