What is it you're planning to do with this system, and what hardware spec are you planning to build into it?
If you're looking at a portable rackmount system, it sounds like you're aiming to build some super-high-end dual-core workstations, or hugely disk-dense file servers, (or both) but still have them reasonably convenient for traveling.
If you're not building that, why do you need anything rackmount? If you want a reasonably powerful computer that's also portable, why not a top-end quad-core laptop? The i7-3610QM is the exact same piece of silicon as a 3770k based desktop computer.
Even if you need desktop components, why not get a small-form-factor case and build something like that. You can fit a laptop in carry-on luggage... you could easily fit an SFF case, or even a moderately sized HTPC case into a standard suitcase, suitably padded. I've taken a SIlverstone LC10-E across the Atlantic with me (padded out with socks and tshirts!
). You could even mod a suitcase with a proper dense foam lining or something.
If you're looking to take a high-end visual effects studio around with you, I can understand the need for a rackmount transit case... but otherwise, I don't quite understand what you're trying to do.