Well, for starters, that is no more than a rip off of the work of Jason at DFA. Pure and simple. Leon does not deserve any credit for its design or operation. He merely reverse engineered a V1, inserted his own "made in china" components and posts the info to his website.
As far as components: Much better and well thought out designs are are available. Some of the components he copied the design of are actually "Made in the USA", of which nothing WVO designs puts his name on are made in the US to my knowledge. Others (FASS, Arctic Fox, etc are US made).
Please check out the sticky on WVO components......
DIY WVO Components
Also, I would like to add that I have nothing to gain financially by sharing the above info...not one thin dime. It is widely known that WVO designs uses China manufacturers, while his competitors make their products in the US. That, I have a huge problem with. Part of this whole alternative fuel movement is to embrace "Made and Fueled in America". I guess it is of little importance to Leon.