I built a couple of amps from scratch. I used turrets because I got a bag full of them from the surplus shop. I didn't find them any easier to use than eyelets.
I don't know about grounding schemes; I know there's a lot of different systems, but I always figured that old Fenders sounded good the way they made 'em, and a little bit of buzz just adds to my reputation. My Bassman copy was known as the Three-Mile Island amp, and my Vox copy was called the Buzz-Bomb.
As for changing components, there again I'd say my old Fender '55 5E3 sounds pretty good and I don't know what I'd change to improve it.