Pingmaster, alps skcc green, typing on one now. Extra smooth and delicious.
You can either wire a teensy to it, or you can take the easy rout and e-mail hasu for his tmk4704 for 45 bucks.
https://geekhack.org/index.php?topic=54706.0Currently I use it as my school driver, I love it. Takes a week to get used to it, has a fairly short throw, 3mm, but its my fastest typer.