Finishing the First Shelf

After cutting the ends off with my circular saw, I used my orbital sander, with some 60 grit, to get the planks flat and even. I used my router to make a tongue on both ends. I'll have to remove about two inches of the tongue on all four corners so the shelf will fit within the legs. I know, it's weird but that's what I came up with.

I cut slots on the inside of these apron pieces to hold the shelf top in place. I'm already starting to think this may not work. Stuff is never going to fit right.