I successfully made and tested another board based on the QFN32 version of the KL25Z device, the smallest package it comes in. It’s a pain to solder down because the PCB pads need to be pre-wet with solder, a generous helping of flux applied, aligned via eye-ball, and then hot air gently blown so as to melt and reflow the solder. A soldering iron top is too fat to get down into the crevasse to solder.
The schematic of the board is here:
The Eagle files and fabrication output are zipped up here: MicroKL25Z-DIP
Three boards may be ordered for $4.25 here: http://oshpark.com/shared_projects/MsCRJIem