Enclosures can be from open wire all around to closed on all sides with a wire front. Diamond Doves are a hardy bird, however, they must have escape from the elements. Drafts must be avoided, especially in colder weather and they do not do well in freezing temperatures. Determine what will work best for you and will fit best in the location you selected for the cage. If a heat source is needed, select one that is safe for you and your doves.
Many fumes can be deadly to birds, and flying can stir up dust and feathers that are very flammable.
Tape or cover in plastic any sharp edges that may injure your doves. It is best to avoid smooth slippery surfaces for footing. Dirt, concrete, paper, pads, sand and wood chips are all good for the bottom of your housing. Select what will be least expensive and easier for you to clean and maintain. I use dried clean pine needles since I have an abundance of them in my back yard.