From the CAD geometry I knew that this would be tight but that the figures would fit on the platform, what was less clear was if the figures could be placed between the pillars.
30mm round lipped display bases
The answer is - YES THEY WILL! You have to tip the figure to get it between the pillars and it is a little fiddly but I think worth the effort to keep the overall design of the tower.
The roof shown is the prototype for the stables kit - the watchtower will have the canopy shown in the CAD images, but it shows the versatility of being able to swap roofs should you wish.
Standard 25mm bases
Figures here are Hasslefree Grymn (space dwarfs) on 25mm bases. They are just what I had available and based. No tipping required here.
I don't seem to be able to get away from Pringles tubes do I?
It would also be possible to mount the watchtower platform on the top of such a tube extension and then the canopy on top of that. (I meant to take a picture of that but I have glued the platform down ... doh!)
As always comments, suggestions and your money are greatly appreciated!