Hey A.J. My condolences on the family illness. Glad to see you're back at it.
To my eyes, your shins look correct. I assume they are overlapping by different amounts in your picture, as they look vastly different in size.
As for your questions ..
1) Cover strip ends - angled or slightly rounded are the ways to go. I personally like your personal feeling on the rounded corners. It look s best.
2) Popper - yes, those are snaps
3) Snap plates - Both ABS and webbing work great. Both are reliable. Only abs plates are repairable if for some reason your snap is pulled out. A webbing plate would have to be replaced. Webbing is faster to fabricate. Webbing also has a slightly thinner profile as you don;t have the thickness of the abs to contend with. It's personal preference.
4) Webbing color - I don;t know why we use black (dark side?), but yes, white makes sense. If anything, we are wearing black undersuits, so it's all hidden anyways.
5) Hovi Mic Tips - the ends are a black/white combo - mostly white from wear and tear
6) Kidney - the kidney notches are optional. If ever in doubt, consult the CRL.
Nice work & keep going!