Vic, thank you for being so kind with that question - I receive it a lot.
My thought process as I entered into this is that I would create it as a one-off to share my passion for bingo pinball with folks who might not have ever seen or played one of these great machines before. Based on the better-than-expected response from last year, and hopefully continued good response now that it looks like a finished product, I think we can check this one off - I meet people all the time who are interested in the game, which opens a conversation about the wider world of bingo pinball.
My second goal was to be able to learn in-depth about the hardware design that went into parts of the game that I had never investigated deeply - things like the mixers and the reflex and their effect (or not) on the overall portioning. I think I've accomplished this goal as well.
Thirdly, I wanted to share the code with the world, so that anyone could produce one of these machines if they so choose. They will not have the art package used on the cabinet, backglass, nor the individual games' backglass artwork. But I have upheld this and continue to make public releases of my code. I have several interested parties who have voiced intentions of building their own game, and I suspect several others who are not so outspoken. So I consider this a work in progress, but progressing well.
The reason I thank you for being kind with it - and the answer I frequently give is that the time and money it would take would require me to quit my job and dedicate hundreds of hours of my time to making sure each game is perfect. As it stands currently, the wiring inside is ok(ish) for a one-off, but I would want to make harnesses and do things a bit different from a production standpoint.
I made an intentional choice to use off-the-shelf parts. I've frequently been tempted to use something custom or odd, but have resisted either due to cost or future repair possibilities. For example, the monitor installed is an off-the-shelf 32" TV. If they stop making them for some reason, I can purchase a few and stockpile them to guard against eventual failure.
Same with the boardset used - I chose Multimorphic's P3-ROC system and associated helper boards because they are an established company, have solid engineering, and I am reasonably certain I could order more if needed.
There are also considerations when thinking about production that I have not had to compromise on in order to achieve my vision:
1) Button drawer - I wanted the 'feel' of pressing the real button and getting that tactile feedback. Unfortunately, no one in their right mind would engineer something like that for a mass-produced game. Too many failure points.
2) Availability of parts - I don't know how many more NOS footrail plates there are in the world, for example, nor how many of each type of playfield. What does one expect if they order a game?
3) Distribution of artwork - I have intentionally kept the artwork (aside from schematic) to myself - I don't want to step on any toes with regard to copyright, trademark, etc.
This is a fun hobby for me - I have a job! I don't want to get completely burned out on my passion. This project has been so difficult that that has almost happened a couple of times. I have made concessions for practical purposes (replacing screen printed glass with decal film), but have never wavered in my resolve to complete this project.
I could not guarantee that I would feel the same after 100 builds...
Lastly, my wife would kill me. My family has been deeply wrapped up in this project as well. I could not do that to them. I try to only work on it late at night after my family is asleep, but I think that has taken a toll on me as well. I recently read through the whole thread and noticed that I start to sound a little strange after a while, and not my cheerful self. I think I need to just play the game after completing it.
At lunchtime today, I hit two red letter games, made multiple red, yellow and green hits, hit the supersection and played United's Serenade (on which I failed miserably). I need to get back to playing the game and having fun - something which I have backburnered for about a year and a half+. I love these games, I love the technical details, I love playing them.
I do not relish the thought of making more. But the tools are out there! I will publish a manual which will list the Jones Plug mapping and various operational and parts lists. The hard part (the code) is done. It can be done again. I just don't think I'm the guy to do it.
I hope that's not too disappointing. I truly appreciate the excitement that motivates the question and that makes me very happy. I take it as a very high compliment.
I have another different game build I'm doing which is also too ambitious, but it's next on the list after York.