Good start! I'd suggest not using cornmeal though. It's good for sifting, but as you mentioned, it molds easily and mold and definitely destroy your colony.

I'd suggest using wheat-bran. It's MUCH cheaper than the cornmeal. I get it for about 80 cents a pound which goes a lot further than a pound of cornmeal. I do a 2-1 mix of the wheat bran and Pro Gutload. I'm just about to upgrade my colony to a larger drawer system. I'll post pics and stuff when I get them transfered over.