As a live setup, this is just too much. There is a pageantry to a big setup when you're onstage, but one 12U case (or, frankly, 6U case) is already quite a bit of stuff when you only have two hands. This is enough to keep 4 different people stressing out to keep track of everything.
As a studio hub for experimenting or just general production work, things obviously change a bit. However, the big systems that people like Red Means Recording use to make professional sounding and well-thought out music like you could get from a DAW (or at least be able to keep and use the results as if it werw that kind of music) are built piece by piece. If you're on a budget, not being too tied to a specific plan where every piece is interdependent is best - go where the deals are.
Let me ask you this: roughly speaking, if you had to describe each of these cases succinctly as "the (blank) case", what would each one be? For example, "the Buchla case", or "the sampling case", or "the techno case" (though, if this describes all four, maybe don't pick that).
edit: Sorry - I posted this without seeing your new post.