Hi,
Well, this thing is nearly 600 watts and that's not exactly a power supply that should be your first power supply you ever built. If it was 18v and 1 amp, that would be entirely different. But that 30 amp requirement makes this a lot more involved. And if you are going offline rather than with a transformer then you've got some safety issues to think about due to the line voltage hazard potential of 120vac.
So you think you really want to tackle this thing, or start with a smaller power supply first?
Im not sure what your electronics background is either though, maybe you can fill us in with some info like what kind of projects did you do in the past, what kind of test equipment you own, etc.