Adding Additional Room

I am still trying to design my CTC in my head
and need some experienced advice. I will be using my CTC strictly for camping only so I am thinking I can cut cost of an 8 ft. x 18 ft. trailer to maybe an 8 ft. x 14 ft. if I can come up with my design. What I'm thinking is purchasing my trailer with a rear ramp instead of barn doors. When I lower the ramp I would like to use it as an expandable room/ bedroom. This would involve having some type of frame work made along with a RV style material made to go over the frame. This would seal around the ramp door and back of the trailer making it weather proof and would be similar to a pop up camper. I would then use the room mainly for sleeping quarters opening up the main body of trailer for relaxing and cooking on days when weather would force us inside. Any one know of a company that could make something like this or your thoughts? If anyone has drawing ability maybe you could throw a sketch up here of my idea or let me know how to post my own sketch.
Thanks


Thanks
