Would need to see more views of the bathroom.

It depends. Where are you installing the faucets? Can a linen closet be installed by the vanity and still have enough space to open the doors and not hit the tub? What type of tub surround are you doing? I wouldn't like to see a linen closet blocking the tub view from the door. I'd opt for center and perhaps have cabinet drawers or open shelving on either side of the tub, but not a tall cabinet.

Here are a couple more shots

Right if toliet isn't there yet.

Thumbs down on the right; why crowd the vanity?

Toilet is already on the right of the vanity, about 6-7 feet away. We have a very large shower in front of the vanity, but we need some storage space for towels and such. That is where we need some advice on where to put the tub and storage.

Is there enough space to center the tub and put cabinets flanking the tub for towel storage?

If you like this look, you could slide the tub to the wall/vanity and put storage at the other end of the tub.

That was one of the options we had looked at. The only problem might be trying to open a cabinet on the side where the vanity is.

Good point. It would have to be narrow drawers on the bottom which would defeat the whole purpose.

We recommend making a simple floor plan when doing any remodel project of this scope. It can help prevent roadblocks such as this.

Putting the cabinetry to the left of your vanity looks like it will work. Measure the floor space to determine if the door(s) would open.

Your spa tub requires a skirt build up which adds thickness and requires additional clearance.

Your floor is concrete? Are you not concerned about cutting the concrete to install the drain line???

We are actually gonna go above ground with the plumbing and hook up to the sink. We would rather not cut if we don't have to. To the left of the vanity I believe there is 42" of space.

I am all about space. My opinion would be to center it and get a beautiful basket or a rustic metal bin for white towels and use your vanity for face clothes. Do you HAVE to have a linen closet? I'm sure it will be beautiful!

What about a corner linen closet on the left of the vanity with the door opening on the 45 degree wall and then butt the tub up to the linen wall? Is there enough room there to fit a door on a 45?