ideas to build the most inexpensive camper! ideas? for fun!

Hi. We've been campers for years.
We have a 27' tt loaded slide, etc. Now, I really enjoy this forum, and all of you camper guys/gals out there, picture this: The cheapest,(safe of course) hardside mini camper. Now, how about suggestions? Build it cheaply with basic materials(maybe pole shed siding? . I'd like to build a quick camper(wife thinks i'm nuts) that would sit on a utility trailer. But my objective would be to make it as absolutely inexpensive as can be. Just because it would be a fun challenge, not that i have to. What do you think,any designs out there that could be simplified, and cost cutted? thanks, have fun!
