West Hills Shire
In my expansion of the Keep on the Borderlands, I opted to have a small town adjacent to the Keep as well as some neighboring demi-human populations. In that vein I decided a waterfall elven stronghold upstream, a dwarven cavern stronghold in the foothills of the nearby northern mountain range, and a small shire in the rolling hills the west of the Keep.
Here is my halfling Shire Fort (you may recognize it being based on the Moat House from the AD&D Village of Hommlet module). It is a wooden structure 14' in height (not counting the towers, which are 18' up plus the 2' battlement for a total of 20'), tall enough to barricade unwanted critters yet small enough in scale to accomodate the inhabitants. It is a wooden structure, the curtain walls fabricated from hevy logs lashed together shaped with battlements for defense. Arrow slits pierce the outer wall at regular intervals, and heavy crossbows are mounted along the top in lieu of ballistae. A pair of light catapults rounds out the defensive artillery.
Note that the cielings are 5½' in height, considered "vaulted" by a halfling standards but cramped for humans. Only the courtyard, NE assembly chamber, and rooftops are suited for taller outside visitors. Any invaders over 4' tall can expect accrued penalties if fighting erupts within the enclosed areas due to restricted/limited movement (suggested -2 penalties for armor class and to hit rolls).
The retaining wall surrounds the shire in a semi-circle and has several perimeter towers along with a larger tower at each end. Heavy moss growth keeps the wood moist and as such it is not as prone to normal fire.
(click on any image to view a larger version)
Fort - Ground Level
Heavy crossbows line the battlements along the catwalk and overlooking the courtyard & assembly chamber. A pair of tents are erected for temporary command centers (typically used for rest and recreation during peacetime). Two light catapults occupy the southern towers, the catwalk extends east and west toward the perimeter towers.
The perimiter towers are spaced evenly at 300 yard intervals. Boasting similar construction as the Fort, the Perimeter Towers are a two tiered "tower-on-a-tower" design. The base tower extends upwards to 12 feet in height, joining the catwalk and battlements for a total of 14' in height. Up to 40 halflings can be housed in each tower.
Perimeter Tower - upper levels
End Tower - 2nd level
End Tower - 3rd level
The fourth floor (18 feet up) is complimented with 2' battlements along the outer wall and has five mounted heavy crossbows, along with winch controls for the drawbridge. A wooden door leads to the inner tower. Floor five is 24 feet up and is pierced with arrow slits. A ladder goes up through a trap door in the cieling to the roof level. The rooftop (30' up) has 2' battlements for a total height of 32'. A trio of mounted heavy crossbows compliments the light catapult.