I just measured a VO diagonal rim and the rim extrusion is
24.4mm outer width
18.2mm inner width
16.2mm total depth
570g in 584mm format (using my scales anyway)
nice thick braking surfaces (~1.7mm at the most stressed point just above the BSD)
The extrusion reminds me a lot of a Sun CR18 rim, but the VO extrusion is just a bit bigger, heavier (and hopefully stronger) all round. If you like shiny things, these rims are nicely polished.
A wheelbuilder local to me describes them as being 'a PITA to build with'. The main reason being that if the spokes poke out of the top of the nipple at all, they are in danger of poking through the rim tape too; the rim is double walled but the cavity is very shallow. If you wanted to dress protruding spoke ends, you would need to use a burr grinder. A secondary reason is that this particular wheelbuilder leans on a horizontal wheel both sides to stress-relieve it. This means that a rim that isn't super stiff (in torsion and/or bending) is in some danger of pringling in a heavily dished rear wheel.
cheers