Classic British Flight Sim

Hi gents

im easing my way into scenery etc for fs9....
i have created an airbase with afcad, parking slots taxiways etc,

i want to add some buildings.....

i have objectplacer, do i need anything else, and can i use existing buildings etc....

for instance if there is a building in an addon pack that i already have....

im after aircraft HAS's for military use.....

cheers

neil