A flaw in my design was leaving out a detail on the timber corner posts which had been bugging me. In order to achieve the ‘correct’ exterior dimensions and not build something that would collapse the ground under it, I decided on the whole to use relatively thin timber (12-18mm hardwood)  for the various aspects of construction.

Various details such as above the windows, around the light boxes, and the corner posts have a very much stepped design giving the prop a 3 dimensional depth. By the time I’d completed the corner posts, I’d noticed that I’d omitted an extra ‘step’ and thought that I’d add these back in by creating some shaped timber slats to straddle the height of the corner posts.

This is also a slight design variation as the timber detail highlights the light box (as used by the Ecclestone & Tennant doctors) but is not seen on other props where the lightbox simply sits on top of the corner posts.