Take a look at Strasser Woodenworks. I have one of their 48" vanities and a matching overjohn. They do have matching tri-view medicine cabinets, and you can choose from a variety of styles and finishes. Link - Strasser styles & finishes Link - Strasser medicine cabinet examples

I am looking at the same RH cartwright as well. I would definately do the small for a 36" vanity. I'm doing a small for my son's bath and his vanity is 48". Part of it depends on how you will do your lights- scones to the side of the cabinet or fixture above. We are starting framing next week. The joists and subfloor on the first floor are in. FYI, RH will have a bath sale shortly after christmas and I plan to purchase the cabinets then. I'm trying to decide which size to do in the master. We have 2 vanites and each will be about 54-57". The big one sounds enormous, or maybe it feels wrong for that style of cabinet. Any opinions? Here is a link that might be useful: RH cartwright medicine cabinet

Hi Annette, Thank you for the feedback. I think you are right that I don't have to keep all the mirrors the same. This is good timing as I came back from my pre-drywall walkthrough and it looks like builder forgot to frame out and make space for the medicine cabinet style mirrors in the bathroom! I am trying to get that fixed as best as I can, but the middle mirror cannot be recessed into the wall as their is a main structural beam there. Because of that, I am going to go ahead and replace the middle medicine cabinet with a standard mirror and have it come out the same thickness as the recessed mirrors to match. I found a 3'x5' mirror for $50 for cheap at Lowe's that will work I think. It's a bit taller than I might like, but I am playing around with the height. This would solve the issue of not having mirror low enough. I can set the mirror 3" above as some of the sample images you should me or a bit higher, but I think this may all work out in the end for the better. My house will be in a Contemporary /Transitional style. Thank you!

WG Wood products in Florida will custom make in-wall cabinets that also are partially outside the wall. Here is their explanation: "Maybe you would love to have the depth of a deeper cabinet, but you only have standard 2x4 walls. Well, this option is your answer! The SixforFour Option gives you a 5.5" deep box, but it's made for standard 2x4 wall construction. So 4" of the cabinet box goes into the wall, the other 1.5" sticks out. But we use a custom trim just for this which cleverly disguises how much of the cabinet is actually sticking outside of the wall. It's a great way to get extra space without any sacrifice. Counting the door, you will have approximately 2 1/4" on the outside of the wall. We can also do this same effect on a 7 1/4" depth cabinet box by special request. Just give us a call and we can help you with that custom order." They make everything to order, I think, so it is easy to work with them to get what you want. They have so many options it can make you dizzy. I want the cabinet for the toilet brush and plunger, one for toilet paper and tissues and a little waste basket, one in the hall for a a fire extinguisher! My problem is I don't have enough walls.