Flightbeam KDEN already comes with a GSX scenery customization file, named kden-flightbeam.ini in the flightbeam\KDEN\scenery folder.
Find attached a customization file for FlyTampa Dubai
I don't have anything about the Doha scenery, but maybe another user might help. Do you find difficult to use the included GSX scenery customization editor to make a configuration yourself ?