Further, I don't see why you can't stash as many tools as you like on the laptop - if you have it locked down enough with the correct firewalling and physical security mechanisms, unless the IT team you are up against get tipped off by the manager who signed you on, they're unlikely to employ more than the basics to check the system out.
Also, there is no need to change the backtrack artwork or anything like that - just throw a custom backdrop on, hide the menu bars and set a screensaver. Screensaver even reduces the need for the terminal loop.
lol, its better if you drop a hack and modded fonera somewhere anyway
Side note: I once got an unencrypted WAP stuck into the back of a banking rack. It was an accident I have to confess, but nobody thought different of it. Stupid bank for not having dedicated hosting for those machines I guess.