Coley,
Those boxes look really nice. I'll have to check them out next time I'm at the flyshop.

I saw this on another board and thought it was a pretty good idea for making a inexpensive waterproof box.
http://www.stripersonline.com/t/798081/diy-water-proof-fly-box-on-the-cheep

I made one last weekend out of a non-waterproof box for some bass bugs I had. The box didn't have any dividers so no need for the dremel.
No thing of beauty, but quick, easy and functional. Total cost around $5.00.