Those look like an excellent find in fact I may have paid more for the exact same set from
LittleMachineShop.com - Search but that was like 3 years ago so it now its water under the bridge ive been working with pulse width modulation since about 95 but never considered doing one until lately and noticing your thread upon further research I find lots of people doing different designs but all with the same concept making a dc motor controller. Heck I even seen one design where the guy was using the fets in a circular configuration for a more even heat distribution. Some guy was doing one where it was all soldered in componets no programming what so ever. I myself have a warp13 pic programmer and have owned it since about 2000 or 2001. Too bad the guy that made them Jim Robertson just stopped making them because they would also work in mplab as a picstart plus as well as its own software and he would come up with improvements to his own design.