I am not sure abt desert regions, but you do want to keep your cages and materials used dry. I understand that shouldn't be too hard for you in desert surroundings. I agree with Samantha. No wood hutches. The cages I have bought used had to be modified and reinforced, the new ones I bought were too expensive for what material is in them, but it can be costly to buy and make your own. I use a 24" x 24" x 16"-20" tall cage for my bucks. A minimum of a 30" x 30" and similar height for my does. And a 36" x 24"-30" with 16"-20" of height for my fryer/grow-out pens.
I prefer to buy a roll of hardware cloth or mesh that is 1" x 2" for the sides and top. They need a
1/2" x 1" sized mesh for the floor. You can get those rolls too, but stock up or buy ahead because where I am is harder to find. Almost any farm supply or hardware store supplies these materials.
You need the clamps and a pair of the clamp pliers to connect all joints or anywhere needing a connection. You also need something to cut the mesh. I would recommend you do a minimum of a 12" x 12" doorway, and obviously the door needs to cover the hole and overlap the side walls material. I would use 14" x 14" for the door. Same clamps to build cage can act as hinges, and you can purchase latches as well as a split tubing to go over the cut edges of doorway to protect your hands/arms and the rabbit from getting scratched or gouged. Figure placement of feeders and holders for water bottles if you plan to use these things.
If hanging or stacking on a rack of some type, make sure you either use catch trays that do a good job of protecting any cages down below, or do not have cages stacked.
Hope this helps some, but I guess you have been doing this already; just figuring on new or used cages in the near future. The shed, garage, or barn you are using should have air circulation. Make sure it is vented somehow, and use fans to help move ammonia away form the cages/rabbits.