[jyl]

If I use vessel sinks this would be less of an issue. The P-traps would still take up volume in the vanity, but the sinks would not. I'm not sure I want vessel sinks.

Another option is to have custom sinks with the drain at the rear edge of the sink. The P-traps could then be along the back of the vanity (the "P" in a plane parallel to the wall) leaving most of the vanity depth for drawers. However, from my experience with custom SS kitchen sinks, I suspect a pair of custom SS vanity sinks will cost at least $2,000.