That's a long story...my wife saw an article in the Sunday paper about teardrops making a come back. How expensive could they be?

$13k for the 4x8, which I don't fit in very well or $20k for the 5x10. No freakin' way. So, I checked eBay for plans to build one. I bought a set of plans and found an error on the first page. Wrote to the seller and he said oops, hey, mistake...then on page 2, 3, 4...he stopped answering.
So, I'm an engineer, I can figure this out. So, got to work with a free CAD program and putting together a process flow for the first few steps (welding the trailer frame, adding the axle and coupler, subfloor...). Then on the weekends we would do the build and I would document what we did with photos and make any corrections to the process.
At the end of the day, we had the 5x10 camper and a complete set of plans, which we sell on eBay. Sold over 800 copies so far. Figure 200 man-hours with 2 people working since throwing around large sheets of plywood, aluminum, or Baltic Birch isn't a one person operation.