Khurasan Miniatures has released the Kilo Outpost. The retail price is $39.99
The starter set has ten parapetted wall sections, four heavily-armored bastions (corner sections) with white metal gun turrets, and a gate section including separate door. The Sections plug into each other by small tabs on the bottom that are not visible when the set is assembled. To expand the size of your outpost, additional sets of parapetted walls are available.
Designed by John Bear Ross. The parts of Kilo Outpost that are cream colored resin were cast by JTFM Enterprises. These cream-coloured resin pieces are very dense and you must prime them with enamel primer (autobody primer, etc) before painting them with acrylics as acrylics will not adhere to the resin surface.
I would love to see some other forts similar to the old Airfix gun emplacements.