Oooh...I think you will have to suffer mulitple cords. I hope someone has an idea, but I'm picturing a case with an LCD on each side. If you want it to show something different on each screen, while having your own display, you could mount a logic board from an older powerbook and split the connection from there. on the board, give it a small hdd and have a custom resolution to have whatever x whatever(3). So the mini mac inside the mac will have a long display, each lcd only showing part of it. I may be guessing wrong. Correct me if I am.
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop