They are more "dedicated sinks" for two people as opposed to being planned for simultaneous use. You could, but probably hit butts as you lean down to brush teeth! That said, these were built extra tall and look closer than they actually are. The longer leg is 42" to the inside corner, the shorter leg is 28." Both are 20" deep.

is this a custom built vanity or can it be found locally?

It is custom built by Platt Builders, Groton MA

Csn the side units be switched... left to right or vice versa?