Thanks to everyone who took a look at my enclosed cargo trailer. It was only advertised on this forum.
Instead of a new project I have decided to purchase a Taylor Coach, from Ontario. Because they only build so many each year I can place my order in summer 2014 for an expected pick up in spring 2015. Taylor Coach makes each of their trailers to your specs. They have been mentioned before on this forum and I'm glad I looked them up again. Below is the smallest they sell, their 8' Lil El all the way up to 24' trailers. You pretty much pick the length, width and your layout.......all in a lightweight trailer!

Since I have several trips still planned I will continue to use and enjoy my current cargo trailer. I'll relist it(of course at a lower price after another year of wear and tear) on this forum and then on craigslist locally at the end of next summer.
Thanks again,
Barb