The only thing I couldn't find is a kitchen counter. Will you not cook aboard? The stove in a corner like that is a pain to cook on if you're doing much of it without a bit of space on either side (even 6 or 8 inches helps).
A full-timer without a permanent bed? Have you tried that before? I don't mind dropping a dinette or folding out a futon for a few days but not every night every day of the year.
I think you could tighten up the rear and gain alot of usable space. My Class C Beaver motorhome has a full-width rear bath and it only takes up 3-feet of length of the bus (you could go to 4-feet and still gain). The layout in the Beaver is a large closet/dresser on one outside wall, a tub/shower on the opposite outside wall, and the toilet and vanity along the back wall between the tub and closet.
It looks to me like you given over a lot of space to areas that will get little actual use and compromised the areas where you'll spend most of your time.
Only you know what you truly like and can live with and how you'll utilize the bus. My observations are strictly from the outside looking in and meant to generate some thought and questions for you, not to tell you how you must do it. I have a strong background in space planning and layout in small spaces (primarily boats but the science of ergonomics still apply) and just wanted to provide some food for thought.
All the best...