In building the cases separate from the bases, my plan was to align the bottom of the face frame with the bottom of the case. Therefore, the base would be the height, 4", of the necessary toe kick.

1. If the face frame is flush with the bottom of the case, what is typically done to account for the height difference from the top of the bottom rail of the face frame to the top of the bottom inside the case? For example, if the bottom rail is 3" tall and the case bottom is from 3/4" ply, the height difference is 2.25". Or, should the reverse be done by keeping the top of the face frame flush with the bottom ,extend the face frame down, and raise the base to have the require toe kick height?

2. The case will have a mix of drawers and doors so with the door sections, should a "false bottom" be added to be flush (or slightly above to act as a stop) with the top of the bottom rail of the face frame?

Hope that's clear. Thanks in advance!

Brett