Here's my latest project.
A panopticon keep design. (Semi-finished)
Base of Keep (Finished)3 Lane access for caravans.View of the upper floor/ panopticon tower.The upper floors are unfinished as you can see, but the plan is to mount an archery tower right here, which will enable archers to pick their targets from the upper floors at ease with minimum movement. An ammo dump at a lower level will ensure minimal reload times.
How does it work? Here is a simple analogy, imagine shooting fish in a giant stone barrel.
The long straight lanes increase time needed to get to the central tower, allowing for a buffer in response time to get your military in position or to seal yourself off if necessary. The straight lines also ensure that ballistas can fire for maximum damage if you want to position ballistas on the lower levels, as compared to a circular onion like design. But only in the North South East West axis.
The floored areas outside are 4 tiles wide to ensure tree growth does not extend to the outer rim of the tower.
The leftmost bridge on the outer walls can be lowered to allow a shortcut access for builders and traders, and the rightmost bridge gives access to the longer, more painful route for sieges and megabeasts.