Placing your semi-modulars in the rack looks convenient. But you're denying yourself access to future modules. You'll probably find yourself pulling one or both of the Moogs out of the rack eventually.

What are using to mix signals?

Perhaps you might consider an Intellijel 104 7U case? You'll have more room for growth as well as access to the 1U space for mixers (like the Quadratt), noise/slew generators, etc.