Benches, shower curbs, and niche bottoms, best practices are that they should be solid surface, not tile. Granite, Corian, marble, whtever you will be using for your vanity top, just have the fabricator cut to fit for that. I prefer the stainless Schluter profiles. They are virtually invisible. Redguard? How many coats?

Sumod- The medicine cabinets are simple wood frames with a cabinet-grade plywood back that just sit in the stud cavity. Because of the dimensions, the front of the frame projects about 1"+ beyond the finished wall. The medicine cabinet doors are also plywood with veneered edges and they are attached to the frame with standard cabinet hinges (Euro hinges). The mirrors are just 1/4" plate glass ordered to size from a glass shop and held in place with mirror mastic and a metal strip at the bottom that you don't really see. The guy who did the cabinets just made the medicine cabinets as part of the job. I don't know about the door brand...we live in a large metro area that has lots of door shops and the doors are just solid core maple doors with the center cut out and a maple panel held in with molding. They're not stained; they simply have a couple coats of clear spray lacquer.

Frankly, nobody should purchase a marble top for a bath vanity. This is always a match/ blend issue as tile and slabs come from different sources. It's virtually impossible. Marble baths benefit from a simple plain quartz top on the vanity. Knock yourself out with marble everywhere else. Porcelain and the real deal stone will ALWAYS disappoint, Every. Single. Time. No bath should be demolished until every needed material has been selected and checked for compatibility. Or this delay is also a guarantee.

These are the pictures of the boxes w/info. We've installed approx. 575 sq ft but looks like we're going to need another box or two due to loosing sq footage from cuts/layout. Thanks for your valuable time!