I received the right-hand Maltron today, and here are my first impressions.
First, it's considerably older than the left side -- 15 years difference between the two, and it has a 5-pin DIN rather than a USB plug. The DIN plugs into a PS/2 converter switch which a previous user tried to attach to a PS/2 to USB plug (the person I bought it from said that didn't work, which doesn't surprise me in the slightest). When I have some time, I will plug the PS/2 plug into my computer, reboot, and see it's detected.
Second, it feels marginally heavier than the left side. The keys are Cherry black rather than brown (like the left side), so I like the heavier keys a bit better. No squeaks, either.
One of the more interesting things I discovered was that a previous owner was definitely a touch-typist. I can tell that because of little adhesive Braille markers on the letter keys. Okay, so that is a bad joke. Anyway, the unit looked well taken-care off, and except for a crack near the cord was in pretty good condition. Oh, and many of the keycaps were heavily yellowed, but hey, that happens, and I'll probably replace them anyway.
So now to the pictures:
Top of right keyboard. The shininess on some of the keys is from the adhesive Braille stickers.
Cherry blacks. The Braille label appears to be a kind of tape, like thick scotch tape with bumps on it. Sadly, those are going to go when I clean the keys.
The DIN 5 pin to PS/2 converter/switch.
The side of the converter thing.
The plug itself.
Looking inside the DIN-PS/2 converter
The crack I mentioned near the cable.
The back of the Maltron with the label.
The bottom of the Maltron, with a reset button and a cool rainbow DIP switch.
Inside the keyboard. It's surprisingly clean.
Close-up of inside. Notice the lack of diode wires that were seen in the left side.
Initials and date of the person who wired it, I think.
Controller board.
Both Maltrons together. Should be fun to set them up together. Even though that would technically make them a split keyboard, though, the number of keys between them makes any further separation unlikely. Still pretty neat, if you ignore the lack of color coordination.
If anyone has any questions, I'll be happy to try to answer.