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Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm

Yes, this would be an acceptable foundation planting.

The following link leads to a pdf article about blue cypress: https://aggie-horticulture.tamu.edu/ornamentals/natives/cupressusarizonica.htm

The plant can reach a diameter of 20 feet. If the trunks are weak, I suggest a metal T-stake driven in the ground about 8-10 inches from the base of the trunk. Attach the plant to the stake with a non-binding material loosely in 2-3 places. Do not tie too tightly, the plant needs room for growth along with the ability to move slightly in wind andd breezes.

There could be several reasons:
Lack of water or too much
transplant shock
herbicide drift

Try to identify any changes the plant has incurred before it started turning brown. If you can isolate a "change in lifestyle", you know where to start helping it recover. If you can't find a change, I suggest you take a sample to your local agricultural extension office for identification and recommendations.

They are only slightly related. The Leyland cypress is a hybrid created from the Monterey cypress (of which the Arizona is closely related to) and Alaskan cedar and does not occur naturally on its own. If you are allergic to Leyland, it could be attributed to the cedar as well, rather than simply the cypress side.