Here's the exterior of the tower with a cross-section.
Interior details are still being worked on, but I have arrow slits, machicolations for the battlements, and small grated windows for air flow (shown here next to a staircase.)
Here's a detail of the doors. Hinges are only on the inside, handles are inside and outside.
Beds come with a strongbox. There's also a locked version of the strongbox for things like treasure rooms. Still a lot of detail to finish.
Plans are to add a lot more interior detail as well as external features (trees, wagons, boulders, barrels, fire pits) to create a "basic" tower. Elements can be repositioned and structures can be modified to create unique towers for specific documents. I would only need external shots and floor plans for pamphlets, but I could set up various scenes for illustrations in fuller adventure modules.