Building portable welder

[shoquest2007]

So seeing how some of these alternator welders work, I have been asked by a few of the local guys who weld and are tired of lugging around big welders to weld thin metal 1/4" or thinner.
They had seen the Zena portable welder i put together, and of course i like to tinker around and came up with this idea ? I would like your input on it or any suggestions.

Here is the one I built, I can pick it up and load it easily in the back of my truck and move it around the jobs easily.




Now here is something i have put together on paper, and have thought about building it but I would like to see what you guys think about it and why it wouldnt work or what would make it better.