First thing I would tell you is that, IMHO, 3/4" is overkill for the
cabinet
carcases, and 1/2" is definitely overkill for the drawer bottoms. I
built
some cabinets recently with 1/2" for the whole cabinet and it worked
out
fine.

For Euro hinges, etc., you will need to use 5/8 or 3/4 for the
carcases.