...if you check the other thread you'll see it's a collection of links to DIY build threads and reading through that list and then reading through a few of the cabinet builds MAY help answer your questions, ...they will definitely show you how others have dealt with similar problems and that should help you figure out what will work for you.
...the first group of links is to cabinet builds and if you scan down toward the bottom of that first section you'll see my motherbox build is listed, ...it ain't easy making the cut, lol.
...here's what it looks like so you can decide if you want to go see how i built it.
...and here's a quick look at my first budbox, $50.00 bucks at the Salvation Army for the unmodified cab.
peace, bozo