I find this cage setup to be very sturdy, functional, easy to maintain and usually very economical. Outdoor shelter for Diamond Doves Aviaries or flights are usually little more than a frame with some form of netting or wire covering it. If indoor, the information for cages applies. Keep the job of cleaning in mind as the size increases. I find it more important to provide lights on timers indoors as people coming and going, turning lights on and off, can disrupt the dove's routine and effect its health and breeding.
Good ventilation is important, but again, avoid drafts.
If the flight is outdoors, you should consider that the overall structure should be sturdy enough to keep predators out. Wire netting buried at least 18 inches around the base will discourage diggers, and clear solid roofing will deter hawks. Some form of structure must be provided for the birds to escape the weather. This should be taller than the flight itself as the doves usually seek the higher areas to roost for the evening. Again try to keep perches at opposite ends of the flight to encourage flying.