You are doing well, researching your info. Sometimes it's misleading and that sucks. Re: asparagus, it could never grow in a swamp! Someone saw horsetail fern ("scouring rush") and thought it was asparagus. When seeking info, try to go to the most professional source. For asparagus, that would be asparagus growers. For human medical issues, the Mayo Clinic or Johns Hopkins University or other institutions' sites, or LARGE advocacy groups like those for Arthritis, Lupus, Muscular Dystrophy, etc., not little sites with no serious credibility or research experience. Backyard Chickens is an excellent resource, but we posters are only human. LOTS of people extrapolate: Example: Chlorhexidine (Hibiclens) is an excellent antibacterial soap. Used in operating rooms all over the country. Therefor, a poster recommended it's use on a hen's prolapsed vent tissue. Seems logical, but: Chlorhexidine should Never be used on skin that is not intact, and NEVER, EVER on mucous membrane tissue or eyes. It is absorbed into the bloodstream if used on open or mucous tissues, and would damage the cornea of the eye. Iodophor prep (Betadine) is used on non-intact skin and mucous membranes, Opthalamic Betadine ONLY, not regular, is used around eyes. If a patient is allergic to iodine, baby shampoo is substituted. So, before using any product on advice from one of us, check it out carefully at sites specifically about the product, such as the manufacturer's instructions.
Wire: depends on which predators / opportunists you have in your locale. I live in a major city; we don't have weasels, so I don't need 1/4 x 1/4. Rats, yes. So for an apron I would need 1/2 x 1", poultry WIRE (as opposed to poultry netting, which is easily bendable and people use in their gardens frequently.) I'd bury the apron fairly deep, as you don't want the rodent (or other) to start digging at the edge of the wire and tunnel right underneath it. You want them to try tunneling RIGHT at the coop edge, and promptly run into wire. BTW; patio blocks used on the ground,instead of wire, are not effective for tunnelers: they tunnel right under them. I use the 1/2 x 1" mesh for the walls of my coop so raccoons can't reach in and pull chicken parts through the wires, and poultry netting on top, since my tops must be lightweight panels we can lift, and also cats and other animals don't like to walk on wire that "gives" a bit when they step on it.
I'm sorry about your and DH's frustration. You can only do the best you can. Your inspector will only be concerned about distance from property lines, potential runoff water issues, and minimum square footage per bird and number of birds permitted by your locale. As long as your chickens have adequate shelter, they're not going to go as far as assessing your apron.
Good luck to you, and enjoy those babies. You ARE going to lose some over time to various causes, so start reminding yourself now that life is fleeting, and the best should be made of the time you have with them. Quality of life is not measured by how long we live.