i was reading over a few posts and wondered if the POS idea and Terraforming ideas could be linked. The POS structures will undoubtly require materials but perhaps they dont all need to be high end materials like those used in bot/module construction. Using a terraforming module to remove dirt or plants could create components in the bot's cargo hold. ie Sand, Rock, soil(could have 2 types), Water, Compost(shreaded plant), mineral powder(ground primocitea)

Basic destructible Walls could be made from sand, rock, soil, and water
  the walls could be thin or thick enough to carry bots (might need falling rules for this one)
Or a moat could be dug, lined with rock, and perhaps filled with water

Buildings would probably require manufacturing at a station or outpost. Perhaps with a destruction timer if left unpowered for a long period of time leaving behind similar ruins to those seen around nia.
-A central commond post able to power adjacent buildings using the energy cyrstals mentioned in the dev blog or perhaps by using an isopropentol generator (HDT is cheap and easy to mine).
-Warehouses with an activation similar to the cargo can or corp storage, cargo limits based on size/quantity of the structures
-Repair facilities using remote repair tech and a target back function
-Refining facilites would be a natural addition to reduce transport bulk & perhaps contridute to fuel supplies
-Manufacturing would need to activate production function and have enough cargo to hold any of its perhaps limited job abilities(factory size could limit to modules, light bots, etc)
  -Defense turrets are a natural addition but some IFF protocol for corp members would need to be added
- land mines could also be added and would most likely be weight triggered, but i'd also like to see player triggered if possible, perhaps linked to a small structure that could transmit mine locations to corp members radar.
             a minesweeper module would become needed
-a Gate would also be an understandable stucture to keep out enemy players, but would require interaction to open not proximity
- Fuel tanks (explosive?) could be used to offset refueling needs
     could be vulnerable to indirect artillery fire, a few volleys and your base could have limited time before shutdown
- Power plants (multiple types?) could be used to provide more power