Hmm... thanks for the options and fuel for thought. The idea of a fully hard sided popup was considered before, but seemed like a pain to deal with in reality.
The Wayback machine... that has serious potential. Seems to be the best of both worlds... high enough for most use, proportioned well, and can raise the roof up to standing height if desired. Seems to be a perfect mix of teardrop / crouching / standing. I put together a model with a chopped front, 5' floor to ceiling height, and 4x7' roof extension that can raise 18". I added in my windows to scale as well. It actually looks quite nice! I'm not sure if the final version will have folding hard panels or screen on the vertical raised section, but I can figure that out later. I should probably add in a front to back or side to side arch to that roof section as well to add strength and shed water.