Pocket and Catch
This system uses a pocket into which each leg slides. The legs are secured in place with a cabinet catch. The main advantage of this system is that the legs are easily removed and installed, making it a cinch to switch between 40" N-Trak module and 50" Free-moN modules. This system works decent, but needs to have some sort of diagonal brace to stablize it. I haven't come up with a good diagonal bracing plan that will allow the legs to be easily removed.