If you have a Unicorn account (WORTH IT!), you can do something along the lines of creating a large-scale "composite" build that encompasses all of your cabs. The Unicorn account breaks you out of the 4 row lock that the free account has, and by setting up various tile rows filled with blanks, and blanks to demarcate the different rack sizes, you can set up a pretty good approximation of what you're describing. And you can also save the modules you have to your "favorites" list so that they'll be on hand when needed.