There’s really not much that can go wrong with this build. 
Well, if/when I build more of these controllers I’ll shoot you a DM.
Wow, this is really awesome! Looks so cool! Is the wood-grain box part of the rack-mount Atari? The aesthetics surely match a woody 2600. Never heard of the Sound Paddle and Soundx cartridges, will have to investigate.
Awesome! Lovely 2600-noises!