Thinking of just leaving it like it is. When I cut the bottom half off I cut it on an angle with the angle going down to the back, The front portion has a face plate of about 8 to 10 inches down from the top. Looking at the cabinet you can not see the plumbing until you kneel down to look. I put the new flooring down where the old cabinet set on the floor. I will just finish the baseboard and shoe molding where the cabinet was. Put on a new coat of paint on the cabinet and wall area that became exposed from the bottom section removal. 

Wall hung sinks have the bottom section exposed. They do make vanities with only the top portion.  https://www.homedepot.com/p/Domani-Stella-49-in-Single-Sink-White-Washed-Oak-Floating-Bath-Vanity-with-White-Cultured-Marble-Top-Assembled-SL48P2-WO/300851618

My cabinet is 24 inches wide.

Just the bottom section of my old cabinet had water damage.

I can always just remove the top and install a new vanity top with bowl at a later date.

Floating bath vanity will look just fine.

Paint it up and be done with it.