Was asked to see the bsp for cp_perilous, a single stage Control Point map, based on the over-the-top jungle spy villainy base things you see in like James Bond or the Incredibles. It was a jungle map before Jungle was a thing.
You're free to use/develop the maps out as you please, and use what you want. Please credit accordingly, however no financial compensation is required, should it ever come to it. (Yes, seriously.)