Yeah I really love the 120-key layout! I was so excited to find my board in a recycling heap. ohaimark was there - he's good luck.
I really think Sun was onto something with this one. The extra 12 keys are great for customization, they provide a nice place to put artisans, and they're really awesome if you grew up with an IBM PC XT board and want to use your left pinky for function keys. They provide a natural home for all of the beautiful extra modifiers of the Space Cadet layout. Sure, an IBM 122-key battleship gives you a second function row. But this gives you a regular ANSI layout, media keys, and extras. Heck, even Razer copied this design with the Blackwidow. I wonder why no one else offers it anymore?
The last thing in the world I want to do is to hijack this thread and turn it into an advertisement - coverage of my boards is in plenty of other places. But, because I love this layout so much, I wanted to share that Round 2 of the Hall boards will have a 120-key offering. Here's a sneak peek!

Please be warned: these are not the final production caps. Also, there will be a slight layout change before production: increasing the spacing between regions to 0.5u (9.5mm) to better honor the Sun Type 5 and its derivatives. I'll talk more about it in a separate thread once I clean up the photos.
So, yes, if you happen to find one of these lovely Sun Integrix boards, please post here! I'm going to do a full teardown on mine one day when I open it up for new stabilizers and a new controller. I've already retr0brighted it. Be warned: it has weird stabilizers, a 1.25u Esc, and the included key caps are nothing special. But it is such a great platform for more interesting hacking.