Re: #6 hardware cloth or mesh source
Now, realize that I'm a kludge artist from 'way back. But none of you seem to be considering that as-purchased hardware cloth is made and sold with square(ish) mesh. And that that mesh does not _have_ to stay square. Anyone familiar with "expanded metal"? Just diagonalize that material starting with #4, and you'll have something that bees can't get through and beetles can. Re-form it and it will stay that shape. Then cut it to fit your application. Get clever enough and you can cut to (some appropriate size) and then stretch it to "correct fit."
Or so it seems to me. Of course, others may have a different definition of artist. Technique has an interesting etymology. Look it up sometime.
"I thought I made a mistake once, but I was wrong." (heard often from the late David Sebree) Still making them, myself