Built In Wall Unit - Part IV

Tonight I spent the evening playing in Google Sketchup 3D modelling a part of the room that the cases will be located in - including the outside wall, hall entry and ceiling. Part of this was done to start getting a better feel for any complications.

The first thing was to ensure based on my measurements that there will be a gap between the edge of the case and the wall. The door frame sticks out 3/4" and the face frame frame needs to be show its full reveal infront of the door frame. There is enough gap between the door frame and the case to allow the face frame to slide between the case and the door frame. The wall toes in at the top so the gap near the top will virtually disappear.

On this right case the face frame will overlap the shelf fronts by at least 3/4" (if 1-1/2" face frame) or 1-1/4" if 2" face frame. The face frame I think needs to be uniform across the entire cabinet. Because 2 cases butt against each other the minimum is 1-1/2". Where I'm slightly perplexed is how to deal with the scenario when there is but a single board on the edge. This happens in two places, the middle right cabinet where it meets the right most cabinet - remember right cabinet is 9-1/2" deep and the right middle is 12" deep.

And again on the left most edge of the last case:

Two thoughts come to mind:

1) just put the face frame on flush with the outside edge and let one side have a signicant overlap similar to the narrow case on the far right and ignore the fact that there is a marginal 1/4" overlap on the joints between two adjacent cases.

2) I could add a second board in the left most case so that it is double thick. There would still be an overlap that is deeper then the others but only by a 1/4" vs by 1".  Same goes for the right middle, but there one could double only for the visible part - front 3" and use spacers between the narrow and wide cases to fill in. Less wood wasted.

I've been searching high and low for examples in design books and on the web but thus far I've struck out.

If you can visualize it, this is what the case (minus face frames and cabinet doors, etc) would look in the space allocated for it.