You're lucky to find sconces that only are only 1.5" wide. We have a 72" double sink vanity wall to wall, with sconce>mirror>sconce>sconce>mirror>sconce. Our 2 mirrored medicine cabinets are each 21.25" wide centered over 17" wide Caxton sinks and our sconces round bases are 5" wide, so it sounds like reducing your cabinets to 24" would be fine.

You have to think on the scale of a real-life homeowner, not a designer of high-end homes (unless this is a high-end home!). When things are tight, you look for solutions! If 58" is too tight for two sinks, look at a trench sink - a long skinny sink with a faucet on either end that serves two people. This is the concept, but like so much stuff on Houzz it is marginally useful because whoever posted it just slapped it up without dimensions. In this kind of a get-up, WHERE to center two medicine cabinets becomes the issue, so a single mirror wall does seem to look better. In this example, designer Kelly Gardner does tell us all about her project, which seems only the right thing to do if a designer is getting advertising by posting it here for us to see! She says, " kelley gardner The sink is 34" and the entire width of space is 48". The space between the faucets is roughly 22"Now, doesn't this look like something you could do in your 58" space? Ask your contractor if it is too late for wall-mount faucets (it probably is). Your sink would have 5" more counter on each side. Come to think of it, this may be a shallow counter (maybe they had a space issue) and with a 22" deep counter you may have plenty of room for a faucet. Kelly says that this sink is from Lacava, so if you like this look, review their catalog online, then find a source to buy one. My original bathroom plan was to get a Kohler Brockway sink. Funky, old fashioned and really splash-happy! The Brockway has a backsplash and the whole sink is 18" deep, so in a 22" counter, you can make a little shelf between the backsplash and the wall. The sink has a big round belly that begs to be pulled forward out of the cabinet, and if you do that, you can have a deeper shelf behind the splash. Here are couple of installations.First, this is the smallest Brockway, the 3 ft (36"). It comes in 4ft with two faucets, too. Here, they mounted it against the wall in order to have a bit of counter in front of it, instead of pulling it forward and putting a shelf behind it. Also an excellent choice. This is one of my favorite installations and it also gives you ideas of what you can do with mirrors and cabinets. It is a cottage look, though. This is the "belly exposed" look, where pulling the sink forward gives you room for a shelf behind it. I can't really see a shelf here, but you can see where it would go, where the sink top ends. Just make a shelf behind the sink that fills the space between the sink and the wall. If you have stuff on it, you cannot open the doors of the cabinets here, which is a good reason to leave it off, I suppose! This is the 4 ft model, which is too large for you, giving you only 5" on each side for counter. You should go with the 3 ft, giving you 11" on each side for counter. Wetstyle, from Canada, has many trough sinks. Here are some that sit on top of the counter, just in case the cabinet you ordered cannot take a sunken one.This the the Wetstyle Ove sink in the 48 x 15" size. It is only 4" deep, so you have to be careful to chose a faucet that will not splash the water out. But it gives you rounded corners, lots of space in front or back of it in a 22" deep counter, and you each get 5" on each side to have to set things down. What is even better about this picture is the mirror design. See it? A mirror is inset into the wall cavity, giving you a small ledge to set things on as you are getting ready. It looks like the side mirrors could be small med cabs, if they are not. What a smart design for your small space! Click on the photo to enlarge it and see the details. Click on "More Info" to go to the web page and read what is available about the picture. Here is the Wetstyle Cube collection sink in the same dimension. It is just a rectangular version. Click on "more info" to get a version with the price tags, where you can click on the tag to get a close-up of the sink. Being only 15" front-to-back, there is lots of room for faucets behind it. If you do a shelf in front of a recessed mirror, you may get away with a 4 ft long sink - especially if it gives you space in front or back to set things down. Check out Lacava, Nameeks, and Duravit and you will see many more sinks that sit on top of the counter that are long enough to have two faucets. There may also be some that are "semi-recessed," which means that there is some sink below the counter, too, giving more depth.

My 4 - what did you choose? Would you share your photos? I did draw it out - but not to scale and for different sconces. I've looked at mirror and light combinations until I almost don't care anymore :-D. If you notice the The magazine photo the mirrors aren't centered over the sinks - difficult to see in my photo. Now I'm wondering about sinks - oval or rectangular, aggh!!! Ceiling height is 9' rather than 8' as shown in the drawing. So, that would leave about 20" above the mirrors to the ceiling. I think my calculations were incorrect - I was goofy at this point.

if everyone that uses the mirror is approximately the same height, that would make choosing mirrors that showcase your new tile easier. If you have two mirrors the size shown, you could reuse them, hanging them horizontally, with or without frames. If you want the overhead boxes and light gone but do not have enough tile for that part of the wall, you might consider covering the area with paneling into which you can recess new LED light fixtures or against which you can attach your new light fixture -- or both. I'd want more recessed lights than this one but also like the idea of a second light fixture on a separate switch outside the box in which the recessed lights are installed that could light the entire room. https://www.wayfair.com/Winston-Porter--Whelan-5Light-Dimmable-Vanity-Light-X111249349-L6116-K~W000138238.html?refid=GX433803226217-W000138238_1811975260&device=c&ptid=903084850761&network=g&targetid=pla-903084850761&channel=GooglePLA&ireid=64738416&fdid=1817&PiID%5B%5D=1811975260&gclid=EAIaIQobChMI3NDB0few7wIV__DjBx0YXgrfEAQYBCABEgKfv_D_BwE