OHfam wrote:Is this even possible?I assume it's going to be more expensive.Just entertaining the idea,not even sure it's doable...Just trying to think of different options.Sorry if this is a silly question..I'm new here

What is your goal in making a green teardrop? There are all kinds of green and it depends on how you define it.
I would define green as recycled materials and renewable resources, which is pretty easy for a teardrop. Wrecked pop up tent trailers are a dime a dozen on craigs list. Get one and strip it down to the frame, saving any usable fixtures to reinstall in the tear. Lights, sink, stove, cabinet hardware, shore power plug, converter, breaker box, and/or battery if it has one. That satisfies the recycle requirement.
Select your lumber from sustainably harvested timber. Check online for lumber companies profile, most go out of their way to describe how green their practices are. Nobody clear cuts anymore, most replant, and rotate. Some concentrate on beetle kill timber. All sustainable and green as long as the trees get to regrow.
For any additional fixtures or tools you need, visit the flea market, junk yard, and yard sales. Repurposed things are your friend.
I don't have any recommendations for glues and paints. Maybe someone else knows of some, but I personally would go for the best you can find. Titebond II and III are highly recommended and the last thing you want is a green glue failure!
Good luck and I hope to read about your ideas!