I've got another idea that may work.
I've seen PCMCIA VGA adapters in the past, and looking through the readme's for various xfree86 drivers, it appears that there is some support for them. Also, you can pick up CF - PCMCIA adapters that have their own power supplies. Combine the two, and you have a usable vga card for your zaurus.
Now, the way to do this in a docking station format would be to have the cf -> pcmcia and vga adapters permanently mounted in th sl-6000's expansion sleeve, and use that as part of your docking station.
Of course, once you total up the cost for everytinng (figure the cost of a docking cracle, expansion sleeve (optional), cf -> pcmcia adapter, pcmcia vga card, power supplies) you'd be over the cost of a low-end fully-integrated motherboard w/ cpu & ram. So, to achieve the same effect, you'd put together a very light-weight front end (motherboard with built-in network/video/audio + cpu + ram + case/power supply) for a bit more than $100, have it network-boot off your server, and run a vnc client to connect to xvnc on your sl-6000 via wireless lan.
It would still be interesting nonetheless to see how the guy in the original article accomplished this.
