A couple of ideas
I have thought about building a teardrop trailer myself and here are some things I have considered. 1) Seventy years ago, when teardrop trailers were first designed, automobiles had very little power or storage, hence the trailer's small size and lots of built-in storage. The trailer both had to carry everything and serve as shelter. Todays cars have lots of storage space, so the primary role of the trailer is as a place to sleep and hang out. 2) I would try to use as much stainless steel on the exterior as possible. This is why old Airstream trailers still look good. Stainless steel sheet metal, corner edging and screws would probably more than pay for themselves over the life of the trailer or when it was time to sell. Use lots and lots of sealer/primer on the plywood and some sort of undercoating on the underside or wrap the stainless steel all of the way around. 3) I would leave out the camp kitchen hatchback/trunk at the back. It looks cute but it makes the trailer weaker, heavier, more complex to build and is probably a source of leaks. (If I am camp cooking, I am probably in a campground and can use the picnic table. If I am not at a campground, I probably went through a drive through and I am just crashing for the night.) I would use the extra space in the interior for leg room and for a built-in gear attic for lighter stuff like clothing. 4) RV stores are great places to get necessary items like windows, which are designed specifically to handle both highway speeds and poor weather. 5) I would install a 12 volt car battery on the tongue of the trailer, charge it via the trailer wiring and add lots of 12 volt RV lighting inside, so you can read or cook inside at night. A little 12 volt cook pot can also be run off a 12 volt battery for hot drinks or soups. Install a battery isolator so your car battery doesn't get run down. 6) I would pay lots of attention to ventilation. A RV type roof vent can be cranked open for ventilation and you can also stick your head out to look around if you hear sounds outside. Adding a RV bathroom vent fan with a clock timer switch would allow for air movement on the stillest of nights and cause the fan to shut off once you were asleep.
Definitely post some pictures when you get it done.