I'm currently repairing a Mata Hari playfield and will be dropping it in my Supersonic cabinet (while I store the Supersonic playfield). It gives us another machine to play without doubling the space. I dont have a MH backglass, but that isn't super important right now. I did pickup chimes over the last few months so it will have the chimes that go with the MH.

https://pinside.com/pinball/forum/topic/seawitch-from-scratch-allentown-edition

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Wiring can be very tricky on some titles.

I have a MPU for Mata Hari. Eventually, I would like to purchase a Weebly so I don't have to switch as many cables.

It's all explained in the post with key posts marked.

https://pinside.com/pinball/forum/topic/seawitch-from-scratch-allentown-edition/page/14#post-6577702

Worked on in Inkscape & Photoshop and then exported to Silhouette Cameo 4 Pro cutter.

I can run any Bally or Stern standard playfield made in the -17, -35, 100 or 200 era. Setup for 5 different sound boards and a chime box for good measure.

And a Flash Gordon strobe.
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I am doing this but with a Williams System 3-6 set up. The base cabinet is a Flash. I have retrofitted an insert and reproduced speaker panel from a Firepower 2. I am using the Pinball Technologies NW7 MPU/Driver/sound all in one pcb and a power supply(Xpin). All I have to do is flip a few dip switches and swap the playfield. I have the speaker panel set up with a pair of 6x9s due to the stereo capability of the NW7. I also have it plugged up to a powered sub. Yes, the original sounds are all mono but thats where I get to play around with the Pinsound-like sound customization you can do with the NW7. You can add your own sounds as well have play songs in the background. Just plug the microSD into your computer and swap sound files. I haven't modified any sounds just yet. I did turn off the background sounds on Firepower and put in the main TNA track once. Good times, especially with the subwoofer. I also wired up a chime unit in the bottom. I have four playfields for it- Firepower(hardtop restore with drop targets), Hot Tip, Flash, and Gorgar(Hardtop restore coming soon). I just need to do a few final touches on the light insert in the backbox. Lastly I need a custom backglass. That's why I have been waiting to wire up the player number light sockets. I had to do some custom wiring to get a System 3-6 display setup to fit on a System 7 insert. It has been a challenging but rewarding project.

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BTW, Pinball Technologies also makes a MPU/sound pcb for all of the Bally and Stern early SS games which is called the NB2. It has the same Multigame and sound swapping options as the NW7. Unfortunately, they are out of stock on the NB2 and maybe the NW7 as well. This is due to chip shortages. They will hopefully be back in production towards the end of the year.

I have run across that before but forgot about it, very cool.