Looks pretty good to me! It's a tight space so there's not a lot of options. The toilet roll holder can go on the end panel of the vanity cabinet, that's no problem.....or if you use a wall rather than glass shower screen for the shower, it can go on that wall. In saying that, I would use a glass shower screen to keep the space feeling as open as possible. Possibly a 1/2 height wall with a glass panel above (which would also give you a bit of a shelf for shampoo etc). All the best :)

If you can configure your laundry so that you dryer is on top of your washing machine and open a doorway between the laundry and bathroom (in the wall between where your shower and toilet current is) using a sliding door you'd be able to close off the current doorway for the bathroom and then add a bath along where the doorway and shower is, keep your laundry separate for user ease and avoid moving plumbing (which is expensive). That way you can have a shower over the bath and have both a bath and shower option in that bathroom. My best advice is to go and get some grid paper and drawer your bathroom to scale taking into account the size of all the features you require to make sure that they fit (cut samples out to scale and you can play with arranging things. Remember too that standard doors take up more space within the rooms then sliding (either external or pocket) doors and moving plumbing is expensive so if it's a short term deal before major renos take place avoid it.

Are you kidding us all? That looks fantastic!!! That bath and spout are spectacular and both look absolutely amazing. The spout looks excellent where it is, you do not want to hide it, show it off and no it does not obstruct the look of that divine bath. Well done italiangal

a bathtub full of water plus a person has a specific weight depending on the size and make of the tub and 1 litres of water weighs 1kg and a bath may hold 100 litres...if the floor under the dormer is the same as the rest of the floor there should be no difference in the weight capacity in any part of the floor and the floor has already been tested by the existing tub..A structural engineer should be able to easily reassure you and/or design suitable reinforcing to install the tub into a wide supporting frame which can distribute the weight over a wider area than a bathtub supported on dainty legs...a new bath mounted in a generous surround should look perfect under the window