I have recently been very impressed by the work of Sabol Studios (of Woodstock, Georgia, USA), and thought it might be of general interest. Sabol Design are well known as manufacturers of carrying cases and similar wargame-related hardware, and they also do custom builds and commissions for terrain boards and pieces.
The 15mm Spanish monastery was built for Gary, whose blog The Peninsular War in 15mm is always interesting. I was sufficiently gob-smacked to contact Sabol, who proved to be friendly and very helpful. They are happy to take on terrain commissions, though shipping costs mean that there are limits to the size of items they can send to Europe. I think they may be just the guys to build some extra bits (including a gatehouse and some wrecked walls) for my 15mm Vauban fort.