What is the "long dimension" of your toilet room? I think your layout is fine, IF the toilet room is long enough to meet code (I like 5' minimum from back wall to front wall).

Looks like 4'8".

I am not as concerned about that as I am what type of tub would work.

That is my question.

An oval tub as shown looks good.

I realize that was your question, but you might not want to ignore your small toilet room.

I think you tub looks fine.

You can do it built in, or choose a slipper tub that stands alone, or. What do you like? Have you spent any time on Houzz looking at pictures of master baths with an oval tub? Houzz is very easy to search with almost any search term you choose.

Check this link, for examples of what I mean...

Here is a link that might be useful: [oval bathtub search on houzz[(https://www.houzz.com/photos/oval-bathtub-phbr0lbl-bl~l_68632)

Thanks for the reply and advice.