Noseoil, Thanks for the reply. You are correct on the cabinets, my Keystone travel trailer is full of 1X2's covered in cheap plywood. Good enough for them, I guess should be good enough for me. I really wasn't thinking about the extra weight of it. So maybe stick build and skin with 1/4 birch may be the way to go. Thanks again for the advice.
Sharon, Thanks for the vote of confidence on the new profile. I like to better as well and you are right, it will seem more roomy. My trailer frame is 60 wide between wheel wells so the inside will be approx 58 wide. I still plan on stuffing a queen size trifold mattress in there.
I spent yesterday welding mounting points to trailer since I neglected to have the trailer builder add them. DOH