I've made up my mind and the system will look like a Macintosh SE but bigger. Since the monitor is 17 inches.

The control console will fit right under where the monitor and drives would stick out.

The color scheme will have a mix of old school mac and nintendo. Black joystick with red buttons. I'm thinking to have the little red apple logo and put MacMAME on the right side. There sill not be any drive slots so it will have a smooth front. Now I need to decide on the construction material, might use MFD or plywood.