excel: yes, of course; those designs are certainly practical for urban gardening. Out in the country, the family of eagles and numerous hawks would drool over the new lunch box. Snick! Snick! Still, moving them around during the daylight to where one would want them to be, I see as a great help.
When I grew up in Connecticut, mink and weasels were far and away the greatest threats to chickens. The coons had such a plethora of food, that they didn't bother most farms. Now when they did, they were the most severe of nuisance. Foxes were plentiful and careless operations would get birds picked off by rats. There were also feral cats and aggressive dogs.
At least, we don't have to face a problem that they do in places like India: cobras.
"Keep your state off of my body"
"When in doubt, empty the clip."