Here’s my Full Upright, RetroPie-powered Arcade Cabinet. Here’s the list of components and cost:
27″ CRT TV – Free
Lethal Enforcers Arcade Cabinet – $50
Raspbery Pi + 32GB MicroSD Card – $65
HDMI -> Component Converter – $45
Used X-Arcade Dual Tankstick – $100
The best part is the cabinet’s original speakers and marquee light STILL worked! A buddy of mine helped rewire the speakers to be powered by the TV and added an external switch to the cabinet so the TV can be powered on/off. It’s fully functional now and all that’s left is cosmetic work.