I stole...er borrowed the shape of the little guy. My teardrop is shaped very closely to the little guy trailer. My floor measures 4'4" x 5'9". I'm 6'1" tall. Sounds too short? Mine has plenty of room for me.
If you notice the teardrop curves at the head area as well as the foot area. I use a 5" foam mattress and 2" topper. This is 7" of foam, which raises me up another 3-4". At 3-4" above the floor my teardrops length is (and I just checked it with my CAD as well) 83.4" or 6'11". So, If I slept laying straight out (which I don't, but it doesn't really matter) I'd still have 10" of room to spare. Some people don't have that much room in their larger teardrops.
I've had a lot of people say it was too small for them until they actually laid down inside it.
Just food for thought.
Steve