I am here with, just, like, my opinions, man.
I hope to give feedback without being too much of a downer.
This version against the brick wall reminds me of
Monolith.
I quite liked revision E.
The square form would certainly function, and it's true that it is without a miter cut to be seen which does simplify building it, but it doesn't feel like an arcade cabinet to me. I found E appealing, I'd want to walk up and play it.
I don't think a miter cut should be a dealbreaker - but it's up to you if it is. It might be. Your project is about building something you like, and this is all a hobby.
I think a poorly made revision E with bad miters cut out by angling a jigsaw and wavily tracing the lines by hand, filled in with jointing compound after assembly and sanded, would look better than a perfectly executed build of the simplified design. To be fair, though, I don't know how bad your carpentry is, so I can't really give you good advice. You might be being realistic about your limitations here.
If I got a vote, and I don't, I'd say even a bad job at E is better. But I don't get a vote, and you are the one this thing is to please. Thanks for sharing your design process, it's been interesting reading.
I like markc74's design a lot, but I'm not sure it's easier to build than revision E was. (That said, I like it a lot.)