More progress on the signal tower. Last night I added the door (various grades of plasticard) and the ridge tiles on the corners of the parapet wall (Green Stuff).
Then tonight I've cut windows into the walls and added lintels from thick plasticard.
Also added this evening was the roof hatch (scribed plasticard with hinges from plasticard scraps and plastic rod).
Next up I need to add texture to ground and tower and then start painting.