That's awesome, DC! I've been toying with the same concept since I visited my local queen breeder and saw his set up.
I was wondering, though, about top covers. I know since it's a standard box I could use standard tops, but if I have to open the box, won't that create trouble having both nucs opened at once?
How about making a lid that piano hinges (or some such concept) in the middle so you only had to open one side at a time? Or, just a split lid?