no bathroom?
If I were building a trailer to "live" out of vs. just camp in, I would definitely have a bathroom and shower. Other than that the layout looks clean, well organized, and very functional.
You may want to rethink the size of your trailer (depending on your height). A bed mounted horizontal, the way you have shown, might be a little crowded. Maybe a 7' wide would be a better choice with your plans as a twin mattress is 6'3" long and a queen 6'8".
Good Luck.
B@tt