Meh. I can't be bothered.
If NDB used MLWs, I'd be more interested in saving the manpower...but they don't.
I'd rather have the simplicity of having four garrison templates, all with NDBs, and knowing that no matter which blueprint I deploy to where, the target will be defended against teh nook.
I have made larger garrison blueprints than the couple the game gives by default, as I have noticed in C3 conquering that the default garrisons are too small to do a damn thing, but I cannot be bothered making another blueprint specifically for forts.
Feel free to build some NDB/NDB missile corps and make some money off of me
I still think forts should be nookable, as a means of depopulation. As I said, they ARE defensible. As my garrisons there prove, wasteful or not.