Oh how I wish I had pictures of my first. Although I would be too embarrassed even if I did. I converted some crappy 2 player cabinet into a three player Combatribes. I hand built the most awful control panel you can imagine and printed a paper CPO of bricks that I put under plastic. It was a terrible thing to behold. Terrible game too. But it's all I had at the time. This had to be 25 years ago.
Ugly as fuck or sweet as hell, I don't care. Just post a pic of your first. We all had to start somewhere. This is the first game I converted back in 2006. Heavy Barrel in a Centuri cab: