Polished chrome is classic, low maintenance and less expensive than nickel. If fingerprints, watermarks or bath products such as toothpaste get on chrome, they are easily removable with soap and water without leaving stains. On the other hand, nickel requires more rigorous upkeep. For example, here are the Care & Maintenance instructions from Newport Brass (they make Restoration Hardware fixtures) "General instructions for cleaning and caring for your faucets and bathroom fittings. Our faucets and bath fittings are made of solid brass and are of the finest quality. To maintain the finish on these items, please do not use any abrasive cleaners, rubbing alcohol, ammonia, detergents, brass or silver polish which will scratch the surface. Clean with a soft damp cloth. Applying a coating of a non-abrasive liquid wax to the clean surface of the product will protect the finish. Brass ProTech, product of Brasstech, Inc., can be used on all types of decorative painted and plated finishes. Simply apply Brass ProTech with a soft cloth and let it dry. Remove by rubbing gently with a soft dry cloth. Brass ProTech does not contain harsh abrasives. We highly recommend using Brass ProTech regularly on items finished in Polished Nickel (15), Satin Nickel (15S), Polished Silver (25) and Satin Silver (25S). Do not allow soap scum or minerals in water to build up on the surface finish of your faucets or bath fittings (including toothpaste). These will gradually wear away the protective coating or finish and diminish the beauty of your products. Living Finishes and Uncoated Finishes 03W, 08W, 25 and 25S are living finishes. 03N is an uncoated finish. Depending on maintenance and use, these finishes will naturally weather and change color. Our warranty does not cover living or uncoated finishes. Finish colors can vary and change in color is unpredictable." I recommend chrome in one of the many classic styles available to complement your carrara bathroom.

I agree with emily. if you want leave connections and/or a little extra room for what you don't want, but feel you may need for resale. I think the tub is a pretty important item. wet room not at all, and shower is give or take. i would prefer a big shower and a tub for soaking in, but I have always had the combo. I remember my mom built during big wet bar craze, she did not care for one. had space built, capped off connections and use as a closet. Now it is 35 years later, everyone wants to buy and tear down. Darned if you do, darned if you don't. i agree, I would also really like the separate toilet, we are not share everything people.

This made me laugh: http://www.theguardian.com/environment/2016/jun/09/seagull-turns-orange-after-falling-into-vat-of-chicken-tikka-masala I couldn't copy the picture, but it's hilarious.

We have a 900x900 shower and it's plenty big enough. Neither of your proposed layouts looks that great, to be perfectly honest, sorry! In the first layout, you could improve it quite a lot by swapping the toilet and vanity (centre the toilet under the window on the bottom right of the picture if possible), and having the shower door on the other wall (beside the door). Then, you could have a towel rail on the wall beside the door (i.e. behind the door when it's open), which would be accessible from the shower but hidden when the door was open. An 800x1200 shower might be a good size for your space. You'd have to choose a toilet that doesn't protrude too far, plus a narrow vanity. With that layout, you could have a long but narrow wall-hung vanity, with a big mirror covering the wall between the windows, which would make the room feel bigger and would give a good amount of storage. Also, you may find this helpful: http://www.houseplanshelper.com/small-bathroom-floor-plans.html?utm_content=buffer4aa20&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer