Mine is only 10" wide. This is a Rev-a-Shelf unit that my cabinet maker had to replace and make a custom unit instead. It only had a center track and it never closed properly, but it was a new design three years ago, and they may have worked out the kinks since then. These and the Hafele units come in several widths and heights. Notice that I have a deep cabinet over top. On my custom unit, the top and bottom shelves are 4" deep drawers. That would be better for the bath than metal bars so that smaller items don't slip through. But you could load that up with TP, cleaning and bathing supplies, hair dryers, etc., and have some flat shelves for towels. The shelves on my pantry have a small lip, unlike the metal bars shown here. The commercial pull-out pantries aren't cheap, but it looks like you've used nice finishes in the bathroom already. You might be able to have a door made to match your vanity. Barker Doors here in Oregon is one source.

Darn it, I fumbled my notepad and it posted my comment unfinished. I think the bases in the bottom photo are larger than your 30” ones, so there is more space from sink edge to tower side than yours will have. Elbows are important to consider when you move to full-depth towers next to sinks. Do your elbows ever go out to the sides when your face is over the sink or close to the mirror? With a 30” sink, you could bump against the tower sides. I am super myopic and have to be up near the glass to apply eye makeup, for instance, so I would need room for elbows. If you and your partner don’t get that close, and don’t splash water outside the sinks, you may find your set-up is practical. Others feel it is too close. Tower side wood can get wet. So be sure to measure how far sinks would be from the sides of the towers and if you like that. Another thing people find a problem with your proposed set-up is where to put the hand towels. Some lay them on the counter between sinks, others have a countertop towel holder or towel bars on the cabinet doors under the sinks. Be sure to figure that out before you decide on design. My guess is that the vanity would be longer if you keep your current closet. You have to decide if that matters to you.

@anj_p this is a remodel and im trying not to go too crazy otherwise i love your idea of flipping the master/kids wings! good point on toilet - existing walls are all plaster and incredibly soundproof but this new one wont be so going to make sure to raise that question! im torn on reach in closet - its what they have now, but it feels like being able to shut a door would be nice? were also used to using dressers so maybe a nice furniture piece could be a ckmpromise? going to think about that! totally agree on master bath and Im frustrated our architect hasnt suggested it. the window makes a large shower there awkward but we dont hse a tub! thanks for taking the time tk look and give advice!

Free software allows you to design as much as the game Operation prepares you to perform surgery. This is not a criticism of you personally, just a commentary about how without the knowledge of design principles or construction experience, no type of software will prevent you from making costly mistakes. For example, moving a toilet as far as you are showing can be quite expensive. My advice is to meet with a few contractors and/or designers first to assess your space and advise you on any limitations and potential overall cost. The information you receive may better help you to set a realistic design direction.