that's already how it is though.. i mean, apple even advertises it as such..
http://www.apple.com/mac-pro/
"In creating a pro computer for the future, we wanted to provide an enormous amount of expansion — without being limited to the space inside the enclosure. Designed with built-in Thunderbolt 2, USB 3, Gigabit Ethernet, and HDMI 1.4 ports, Mac Pro sets a new standard in flexible, high-performance expansion. It’s our most expandable Mac yet. And it has everything you need to build a workstation completely customized to what you need and how you work."
I'm not really seeing the benefit of having/needing particular component/enclosures that only work and stack with this particular computer.. it's much more limiting of a set up i think.
...
also, that aside.
it's simply not in the apple design language to have a bunch of pieces click clacking together like that.
or- whether or not it's a good idea, apple is about the last company you should expect to build it.. probably seek other manufacturers if it's truly something you think you'd want in a computer.
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i have a theory that pretty much everybody who is going to buy a nmp already has one.. so they have to wait 3-4 years in between models so they can sell a new one to those same people again..