a photo of your window wall, and a floor plan, would really help people give good advice.

oops never mind! i found your window under the plant. floor plan would still help tho.

I don't completely understand your goals. You want to keep the tub and shower as one unit, but put it in front of the window (where waterproofing will become a pain)? Or you want to put a freestanding tub where the toilet is, and then make a smaller shower so that the toilet fits on that same wall? Are you keeping the vanity the same in all this? How does the doorway have anything to do with any of it?

Disregard the doorway comment. We just want to make this bathroom more functional.

How set are you on needing to keep the window? I removed the bathroom window when I remodeled the bathroom in my previous house. It allowed me to open up more possibilities without worrying about water damage (which I had been concerned about before). And with the new light fixtures, I didn't miss the light!

Not set on anything really! Having a mental block - but you bring a good point about the window - didn't even think about that being a pain to waterproof

It's a large 70s house that we have soooooo much to do with that my vision kind of goes haywire - specially when you want to move walls/ doors ...this bathroom is not even centered - drives me up the wall! So that's why we would like to move the tub elsewhere to squeeze extra inches or just leave as is

Maybe you could just put a linen closet into the space at the end of the tub/shower and leave the rest in place. I'd rather get a new countertop (with a double vanity) at a fraction the price for moving major plumbing around...

ACM - we do want a new vanity and countertop; the one that's there currently is too low and not very functional. My husband did feel the plumbing would be a pain...good point - oh and the old lighting is also going

I have a hall bath similar to yours and I don't think you'll gain anything by walling over the window. In fact, we put a tube light in the bathroom to provide light since we didn't have a window. If you just change out everything with new, it will make a huge difference in the room. Those bathrooms don't allow for much else just because of their dimensions. So, get new tub, toilet, vanity, light fixture, two mirrors and counter and faucet. Yep, I guess that's everything.