I had a few problems, reading the drawing but I tried to come up with something so that we have something to work on.
I tried to draw the plans as you drew them. I have to say it is not what I would suggest and I have a few questions:
-Is that a toilette on the back of the desk next to the closet? If yes, it should have a small sink in it too and the door should be from within the bedroom.
-Are the outer walls really 2.5' because that's too thick. If they are 1.25' on both sides and we can make them thinner it would clear up a lot of space.
I did not draw the stairs because there is no need for them.
Please tell me something. I could send a version with dimensions if it helps get a better idea.