My only real suggestions are:
- Airflow from top of the wall on one side to bottom of the other. Needs to be forced ventilation or overspray kills your work. Ideally not box fans on the outbound air flow so you don't spark and have an explosion.
- Lighting is everything. Needs to have strong, bright, diffused light above the playfields. Next time I do one I'm increasing the power.
- Personally, I think air compressors sitting outside the room with a wall-based spring attachment for compressor hoses would be AMAZING. The sound in a small room would drive me insane.
- I regret not using a rotisserie for the cabinet. No amount of pressure/temperature control was able to stop runs and orange peel the way just spraying on a flat surface could. I'd do all my work over again only spraying flat. Maybe build that into your plan?