Jeff:
With the exception of your popup, I think you are planning on a somewhat standard teardrop that's 5' x 10'.
About your door location. If you look at most teardrop doors, they are located just forward of the fenders. That puts your hips at the door. To exit, you sit up and swivel.
The biggest challenge that I see with your popup is going to be keeping out the water both when it's up and when it's down. And after it's rained and it's time to put the top down. A secondary challenge is cabin's strength without the normal spars. I'm not saying these issues can't be overcome, they just need to be addressed in the planning stage.
Teardrop camping is a great part of our life for my wife and I. But two people in a teardrop can add too much heat and vapor. We had a factory built teardrop that had two screen windows and a small computer fan. It wasn't enough ventilation except when the chill was on. Our DIY has a Fantastic fan and it makes a big difference on warm Idaho nights or nappy afternoons. So if you go with your popup––and your drawing may preclude a standard fan opening––make sure you plan-in some type of active (electric) ventilation system.
Tony