Hey Jerry,
My name is Alex and I'm one of the co-founders of "The Teardroppers" (The kit that you saw on eBay).
I read over this thread and I'd just like to say/point out a few things.
1st off, our kit is not for everyone, it's designed to take a lot of headache out of certain parts of the build. The sidewalls have indents pre-cut into them for spars, a roof channel, your dividing walls/kitchen counter, etc. while still leaving a lot of room for customization with cabinets, shelves, design, etc.
But, as I said, it is a "Kit" and many people love to start from scratch, trust me, I am one of those people. My first teardrop, I built from scratch and hence why I got into this business to save time, and the trouble of "redoing" as you put it, for other people. Teardropping is definitely a DIY community and you have to go with what fits your needs and wants best.
When it comes to our kits you can check out the "For Sale" post we made in that section of TNTTT, or our website has all the info you could want on them
http://www.theteardroppers.com In terms of doubt about the cost of our kits. We use pre-finished White Birch sheets of plywood which add up to more than $100 for two sidewalls. They are also cut to a profile, door cutout, and include all the indents and channels. In addition, the hatch kit is made of imported Baltic Birch (truly some of the best and strongest wood around for a hatch) and that wood is definitely not cheap at all, trust me. With those sidewalls, all the CnC work done on them, and the hatch being essentially an extremely quick assembly, you get a Lot of bang for your buck. Am I biassed towards my own company...of course, but I already said that the kit has to be For You.
With all of those things considered plus what it costs to package and ship 130 lbs of plywood in a 4x8ftx3" box...trust me, we keep our profit margins low so your costs are low as well. And a nice guide is included to help guide you through the process, its' not amazing but definitely a bonus.
Whether you choose our kit or not, myself and this whole community are here to help. The Teardrop community always helps one another out.