Yes, this is one single piece of wood that has had some patches made to it along the center; it is not butterflied. It has two live edges, is approx. 1.5-1.75" thick, varies anywhere from 16-22" front to back, and is 94" in length (to be cut to approx 80"). It will have a vessel sink that sits on top with a faucet to the side.

It's actually a nice piece, and the finishers did a good job of filling in the natural "valleys" in the heartwood. As far as I know, East Indian Rosewood is often used by guitar makers.

Yes, the slab was properly kiln dried, and I'm relieved to hear that means it's likely to be pretty stable. As I mentioned before, it's  been rubbed with that mix of tung, linseed, and danish oil. Only because I'm using it in a bathroom is there any concern; there would be no issue if it were going to be used as a table, for example.

Also, it's not that heavy at all. The current weight is, I believe, about 80+ lbs. It will be anchored to the wall on one corner and the other end will "float" with an angle iron anchored inside the wall underneath to support it. The slab is a full cross section of the tree, sapwood to sapwood.

If I knew for certain that water-based poly would pose no problem, since that's what the finisher would like to use, this would be easy. However, my general understanding—and what I've been hearing—is generally it's oil to oil, and water to water, not to mention that water-based poly can haze and/or peel.

Dee Kuo wrote on May 24^th, 2014 at 1:30am:

Yes you are right, bad math on my part (I mixed up board ft and cubic ft).

Dee Kuo wrote on May 24^th, 2014 at 1:30am:

Yes that is the standard along with dewaxed shellac can go under, in-between or on top of any finish while regular shellac can only go over any finish.

Also, thanks to Mike; I missed his earlier reply.