Really cool idea - a Robotron cockpit. Are you planning a completely rectangular side profile as shown, or was that part of the rough draft? I kinda like the completely rectangular shape/design. I don't remember another cab with that shape.
What is the goal of this? Is it a aesthetically dedicated machine, or is it to be a 'mame-afied' machine? By mame-afied I mean with non-original/exact controls and layouts. If mame-a-fied, then perhaps you could use some gorf-like flight sticks, and be able to play tank games and such. Or you could add action buttons 'under' (closer to the player) the joysticks to play other games.
I wonder how it would look with some subtle lighting inside. Maybe a red glow or something. And/or a lit 'control panel'.
I think that you can configure some front ends to load a specific game when started, and that you can load the front end when windows is started. I'm pretty sure that Mala can do it, I think that some others can too.
Rick