The Happy Ending Kit is a set of rails and the bus with "flying bus boards" (ribbon cables). That gives you a small rack with 10 outlets for 10 modules per kit.
You'll also have to buy their transformer to go from the wall to bus.
http://tiptopaudio.com/happyendingkit/
Since there's no back to the rack then depth shouldn't be an issue. If you have more than 10 modules, I would read up on how to power more than 10 modules with this (what's safe and what's not).
Be sure to MANUALLY double check your power needs as MG doesn't always have that information for each module. Always leave some headroom in your total amp draw versus what the kit is rated for as your power spikes when you first turn on the rack.