Hello "TTTfan", for the lack of a better name. Welcome to the best trailer builder/buyer/user site on the web. You are in the same boat that many of us have been. Just think, with trailer makes like Kampmaster, Kit, Benroy, Scotty Serro, Kuffle Creek, Scad About, Modernistic Cub, Call of the Wild, Hunter Shadow, Camp-Inn, Li'l Bear and Kenskill, as well as the Grasshopper (and others), you have a lot of shapes and sizes to choose from.
Many builders modify some of these designs to suit their own tastes. What is so pleasing, is that there are no two trailers that are alike. I suggest you do a bit of sketching of profiles and lengths and then Git-er-done to suit what you like best.
Good luck on your build, and remember, ask questions, take pics and post 'em and then come and join the happy folks at some of the Midwest Gatherings. BTW, I'm sure you are aware that there is a great camping trailer museum right there in Elkhart. Worth the trip over to see it.

Roly