Not a pro.

Is the powder room vanity wide with a double sink and, if so, are you wanting to cut the powder room vanity in half and put a tub or shower against that left wall using the second/left sink in the double vanity supply lines and drain for the tub instead?

@suezbell, the powder room vanity is a single sink. The powder room vanity and toilet would be removed and replaced with a tub in the design I have drawn up. Electrical and plumbing would all need to be redone, basically a full gut of the powder room, so don’t worry about current electrical and plumbing locations in the powder room. Basically looking for ideas to make a 5’x6’6” full bathroom work.
Thanks!

My daughter has a 5 x 8, bathroom and it is tight, so 6’ 7“ would be unpleasant. Tub/shower combo width is generally a minimum of 30”. You generally need a minimum of 30“ by code for a toilet. This only leaves you with 19 remaining inches. That is not enough for a vanity. Maybe you could have a freakishly small wall-mounted sink?

I don't think the plan you suggest above will work because the toilet must have 15" free of obstruction on each side. This is calculated from the drain. So altogether, you need allocate 30" for the toilet. The layout below requires to move some wall but I really don't see a way to avoid that:

You need a better definition of your goals. A larger master bath? How many people are using the "hall bath"?

To worry about moving walls is the least of the issue. Don't "design" it. show the sketch exactly as the condition exists, and bullet point the "wish list"

Add your budget to the list of the goals. That's how to get real help. And a result worth having. A 5 x 6.6 bath is not a full bath, it's a powder room. A pee and wash. : ) and out.

Could you change the doors so that the master bath is the larger one and the hall bath the smaller? Is it possible to close the door from the master bedroom to the small bath, and access the larger bath from the bedroom? Then close the door from the large bath to the hallway, and install a door in the hall to the smaller bath?

Looks like the door should be moved to the larger room and use that for the main space ...then use the smaller room for shower tub combo

You don’t show if there are windows..?...to me that is the toughest challenge so I would plan on installing good exhaust fans in both spaces...and give extra attention to lighting that feels more natural than flouresent...

Also not clear if you want two entrances...?

In hallway and into bedroom?