I just got a Sunking II PCB in the mail -- pretty excited about this. I've built half a dozen Klones before on vero, but they were always kind of messy and enormous. The Klon circuit isn't my favorite overdrive by any means, but it always seemed like a great tool to have in your bag for recording sessions.
Obviously the Sunking II won't fit in a 1590B, but I am wondering if anyone had planned to build one in a 125B? It seems like it might fit (though just barely, and with no battery).