For installing runners and dividers inside a box there ain't nothing better than hot hide glue because it is almost impossible to set clamps. With hot hide glue you can just do a "rub joint". As you should be able to see in the photo, the lower runners are setting on a spacer as I wait for the glue to cure.
Once the glue cures I'll decide on one or two more trays. I'm leaning towards two more but....I need to see how much space is left after the the lower tray is completed.
The saw till is on the left side of the photo (will be the front of the tool box) and it has 4 slots for saws. I figure two hand saws, one X-cut and one rip and two back saws both carcass. space on the right is for the molding planes and H&R's. Center area is for the bench planes and maybe a joinery plane or two.
I expect there will be room for a chisel till on the front wall over the plane till and maybe on on the back wall as well, it will depend on how wide I make the trays.
No matter how big you make it, and this box is too big, you run out of room before you run out of tools.