It is what you think, rowlman..literally a pc case emptied out with a little grow inside.
And I don't have any links, Heph, sorry. I'm designing it on my own, so I've got no source to show you.
Edit : Basically, take the drawers out and apart, cut the drawer supports out, hang a light, cut some places for fans/filters, get a magnetic latch, weather stripping and a sheet of wood, mount the outsides of the drawers on the sheet of wood, hang it up as a magnetic latched door with weather stripping for light leaks.
That's my plan, anyway.