Latest addition to my SGC base, a underground Puddlejumper hangar with direct access to the gateroom thru the silo-shaft.
It's placed on lv 26 and 25, right above the gateroom.
The Stargate-Wiki says lv 26 and 25 contains living-quarters for base personell. Since that isn't to exiting in a game i decided to place the hangar there instead.