In the middle of this one - help with bookshelf - A Challenge!

Okay, so I don’t think this should have been my first woodworking project, but I’m well into it now.
The idea was the create a book/toy shelf with built-in toy bins in the bottom for the little stuff. So I drew a rudimentary plan and got to work.

But I didn’t think through to the trim/face frame part. I’m rapidly approaching that stage and need some ideas.

These inside corners have been a real challenge for a guy just starting out.

Have a look at the picture and let me know how you would trim/make the faceframe for this thing. I was thinking of doing 1 inch stock around the outer edges and then the inside stuff would just be trimmed with some simple 1/4 inch thick stock.

Oh, and the top is still waiting for it’s final width…open to ideas on how to trim that sucker out too.
Thanks!

http://www.hockspot.com/DSC_0035.JPG