Ha! Thanks, all! Once said, it seemed very obvious that you're all right. I am new to this, and I guess I expected that it was needed. I do have a wireless keyboard that can be stashed in the cabinet.
I have almost all of the main pieces cut out, and then I'll move on to all the small board (stabilizer?) pieces. After that, I'm not sure what I need to do to assemble it. I have the Build Your Own Arcade book, but I'm not using the cabinet plans that the author outlines in the book. I would love to have a list of all the minor pieces needed to build this beauty.
To run the cabinet I have a Raspberry Pi 3, but have ordered a gaming computer with a Hyperspin front end to handle all the MAME requirements, etc. I'm not sure what to do about the monitor yet. I love the way my Mortal Kombat 2 monitor looks for that game, but I don't know how it will look with the new generation MK 9 and 10, as well as other newer games. There are a couple of stand up arcade games that I will eventually buy, but in the meantime I will go with the MAME build. (List of games I'd love to own, alongside of my MK 2 would be Street Fighter 2 Championship Edition, MK, MK 3, and Karate Champ. And if the stars align, I'd love a full environment cabinet Deadly Discs of Tron)
Everyone seems very knowledgeable on this site, and it's a little daunting asking questions. I appreciate the hand holding guidance and will gladly repay my debt in the future. If I can be of assistance to anyone, please just ask.