What I learned and what I'd do differently.
1. I should have bought Saint's book when I started, not halfway through it. And read more from Bob Roberts before I started.
2. I should have gone with a 2 1/4" trackball. More options for replacement, upgrades.
3. Most of the controls that came in the 60 in 1 kit could be better. I started wanting low cost but as I progressed I wanted quality and authentic feel.
4. Soon I will likely be getting a leaf switch joystick like the Pac Pro, or a Wico 4 way. I don't like the kit one.
5. Soon I will likely be getting the best microswitches I can, for the buttons.
6. The front kick panel turned out about three inches short. That was my fault for adjusting the CAD drawing thinking it wasn't designed to fit my precut metal panel from Holland Computers.
7. I'm keeping my eyes out for an ArcadeSD.
So the goal was $500, but I ended up closer to $650. Free: CNC cut cabinet parts. Monitor. Monitor cables. Graphics.
The T-SLG and coin door added about $100. And I didn't plan for stuff like the power distribution block, QD connectors, wire clamps, etc. Plus all the shipping which never was factored into cost.
This all came about because my wife said "one pinball machine" so I asked about a Multicade with her beloved Pac Man. She agreed. Once I had it all hooked up, I got her to play a round of Pac Man. After about 6 moves, she says, "I don't like this joystick at all. It's not the same." And she walked away. So #4 above has become a priority.
I'm already thinking about a multiplayer mame. Some sort of abandoned factory looking thing (inspired by Destiny environments). Time to start collecting stuff.