cabinet build/design question

I was wondering if some of you more seasoned cabinet makers might answer a few burning questions?? I am in the midst of getting some really good books (among them would be 'Cabinetmaking and Millwork, Feirer'). Before I get the reference material in, I was wondering if someone could set me straight on carcase construction with either 3/4 particle board or cabinet quality ply or mdf, etc... At the base of the cabinet (let's use a vanity as an example), there's a 4" kickplate that holds the cabinet off the floor and provides support and moisture protection (I presume). Are there supposed to be cross braces in this kick plate construction? In other words, is it sufficient to hold the cabinet assy. on top of 4 4" boards on the perimeter and one sheet over top without having crossers underneath? I don't know if I am being clear or not but try to envision the base of a cabinet where the kickplate is... Is there anything behind the kickplate holding the cabinet up or is it just held on with the simple frame and a sheet over top?
I have been endlessly scowering the net for good detailed info on carcase construction but it seems tricky to come by. I will start with Feirer's book and go from there but in the meantime, if any of you could suggest other texts, videos, etc. I would appreciate it.
Thanks in advance,
Andrew. (St. Catahrines)
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