I have created a Missile Silo with a Huge Bunker (in the exterior D:), using this and Ic2 Defense addons. Its preety cool (in my opinion) it has all the instructions needed on the signs and even a secret chest full of diamonds 
i totally recommend it to have some fun with this mod (because i made it :P). Its not finished yet and i will do waht anyone aks me to (if i like it), specially Kentington, as the creator of this addon.
Here are some pics
edit: IGNORE THIS because shamely(i dont know if this word exists or not) I couldnt include the images; in the editor its fine but doesnt work here for some reason. 
And the download is HERE