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I know this is an old thread, but I'm really curious about this. You can have a stable switching circuit by exploiting  "lazy" electricity by prioritizing resistance, but in this instance, is this something that anyone has taken the time to research and verify to be stable? I'm not seeing how connecting two crystals in parallel could be a good idea.

Just curious since you seem confident to skip this step, which from what I remember, is a step from getlofi's tutorial. This should explain why the kit is unstable.

If you're using the DIP chips, you could always just do a "dead bug" style circuit, or do it on a breadboard.

I put together a mockup of an internal arduinoboy board. This is an example of how small it can get. Using a different IC package and removing the programming headers, it could be even smaller.

The question isn't whether ground is present or not in the circuit, but if there's an advantage to using the potentiometer's ground.

You may be aware that ground connections in circuits aren't always universal. "Ground" lines can have have different functions and should remain independent (i.e. analog ground/digital ground). But that isn't the case here. In theory, you may have better results with the potentiometer's ground, as the ground points among the board are at slightly different potentials. With that said, I doubt you'll notice any difference between the two.

Any other mods on the unit? Also, who modded it?

I may be missing something here, but I don't see how this will work. How will you solder to conductive ink? Even with custom etching, hand drawing PCBs is insanely finicky and difficult. Especially with SMT stuff.

Can you post a picture of the original PCB? I've never seen one. Might be able to give some suggestions.

There's a lot with different printing like the Manchester one. That one is probably most common out of those types.

Here's one of mine. I also have one that was made for the gameboy commercials and had huge "GAMEBOY" text on it without "Nintendo" printed. Unfortunately the text is completely gone, but you can still see the faded mark. Must have been a different printing method. That's probably the rarest type out there.

International shipping should be no more than $5.00.

I could do with some extra cables. Could maybe even just work out a trade? Feel free to shoot me an email at my gmail (apeshitmods), or a PM if you want to discuss this further.