What would you like in your bathroom? Double sink vanity? Shower only? Shower/Tub combo? Shower and separate tub?

I think it looks good on the paper but to make a code compliant staircase you will have to call a stair company have them do the layout and they will tell you if you have room or not and give you what options you have. In here you wasting your time. With that said, they can probably fit 3' landing with 2 stairs going down and doing 90 degree turn with 10 stairs, that will set you at around 8"+ riser height, here in NJ you can have a riser height 8 1/4" and min thread depth 9" so it might just work. You have to check your local code and see what the stair requirement is for your area and work from there. Good luck

The usual approach would be to put the shower enclosure at the end with the window -- you could make it 48" by 40" so that it would feel spacious. Then the toilet goes on one of the long walls, facing forward. There's really no other choice, since you need something like 30" around a toilet, so it can't go next to the shower anywhere. Since you seem to have some kind of vestibule taking part of your 9 feet, you'll probably just be able to make all of this fit.

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