That looks great, I was thinking of doing the same exact thing 'cause I have the same set of CRTs and some of the same consoles.
My suggestion to you besides sanding and painting would be to get 3 wood slats of finished trim, it'll make the presentation way more pro, easy to do and very cheap. I'tll look phenomenal when you're all said and done, great work. I also was thinking of adding lighting to the shelves, just two small fluorescent bulbs under the panel, it'll look awesome, cheap enough too. Strap the power bricks upside down so you can connect everything on the spot, maybe 2 barrier strips and then one extension to go to the wall. It would also be cool to mount the speakers to the cart, top corners below the TV panel, just set your consoles properly and it should be perfect. You can always make a smaller cart companion for those extra consoles or PCBs you wanna play.
Dude, I miss working with wood and making stuff, it's been years...