Buck

There is an excellent homebrew 13.8 VDC 10 Amp power supply on this site. I was wondering if anyone has ever tried to modify it to 13.8 VDC 100 Amps (by adding pass transistors, etc.)? I have a ham friend who needs one to power up his linear amplifier. He already has the appropriate transformer and other parts. We just are not sure about the current handlilng capabilities of this design.