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My guy ran a vibrating compactor over the clay fill & put Visqueen down before the stone. As soon as you can walk on the pour seal it with clear cement sealer it will slow cure bottom up. My Bud that builds storage units does it that way. He also scores 10 -12' rectangles with a concrete saw. I followed his advice my monolithic slab is 15 years old & no cracks however it is 6" thick on clay the Cherokee Indians used to make pottery.
For security the garage doors should be visible from the home. I use LED motion detectors they light up a 1/4 acre each & only draw about 32 watts power each. 2 large red LED's visible from the outside indicate the alarm is on.
I keep 1 overhead garage door opener remote in the home & have a key pad remote on a outside door jam = never need to mess with keys.
Luck with your shop.