I love both the 4 corner versions.
I like the overall look, the balance, everything really.
I honestly cant think of anything that is missing.
I like the the one with the boxing gloves used only art from the existing cabinet and the flyers to promote it.
So it could have been something you had seen on the cabinet, taking from DK (perhaps the best known Nintendo cabinet ?) I think is awesome too.
I love that you used the instruction portion from the original CPO. Something I wanted to work into the CPO, but could not due to size.
I think really if anything were to be done to it (and I'm not asking! LOL) would be just perhaps the Punch-Out!! text as it appears on the sideart/marquee.
And perhaps a Nintendo logo somewhere. But honestly that is just nitpicking, because I really do think this looks complete, professional, polished, and it is indeed a KNOCKOUT !
EDIT - I can assure you this will be printed and used. And a project thread will be created when I start the project. Rest assured this was not done in vain!
I don't have a printer but I'm going to see if I can print the bezel out over a few pages when I get a monitor and just make sure the opening is sufficient. I think it will be. I know Rick did a bezel on his Galaga project and he just pushed the monitor near flush. I may set mine back, if needed I'll create some form of a shroud using project board.