I went with a manufactured model as a "first teardrop". I bought a Little Guy Cargo, so I could customize the interior -- but I wasn't ready to dive into a full build, yet.
Using this one for a year or two will give me a chance to come up with a "wish list" for a full build. And, going to the gatherings will give me a chance to see what others did, what they like about their TD, and what they would avoid in a future build.
I considered a Cozy Cruiser, but price and weight were and issue at this time. i really love some of the custom-built TDs I've seen on this forum site, too.
For now, though, the LG will be a good starter, I think.