Just found a couple of pages on DIY racks:
http://rack.modzone.dk/Worklog_rack.htm
http://foobar.wykehamist.com/index.php?id=5
I think that the wooden version (second) would look very nice as a
tabletop unit. I'd probably use "biscuits" for the corners unless I
wanted to impress folks with my woodworking skill, then I'd make the
box of Bolivian rosewood with dovetailed joints...
Cheers,
Chuck