Shelly and I are in our extremely late 30's (I was born in 1962), live in New Mexico, and enjoy tent camping; but we're thinking a teardrop will be more convenient, let us get out more often, and be a little more comfortable for extended trips. Shelly's a teacher, and so, after I semi-retire, we'll have Summers to take longish trips, for example to Upstate NY where I have family, as well as to explore the Rocky Mountains and the rest of the West.
Plus it looks like a fun project. I've been lurking on here for over a year, purchased Steve Fredrick's manual and read through it a few times, and have a few ideas (comments please!):
We have a Jeep Wrangler for a tow vehicle, so are looking at something the size of a smaller teardrop in the 1000 pound class. The Benroy shape looks good and seems like an efficent use of space. Shelly says it needs to be 5 feet wide, which seems to be the overwhelming concensous of the forum members as well.
We're thinking about spending a little more than we would for a Harbor Freight or Northern Tool trailer, and having a custom trailer frame welded for us. We plan to cost it at a popular trailer fabricator near Albuquerque, although we have friends who weld, so we may go that direction. With a custom build, I plan to do a fairly careful weight and balance analysis and position the axle accordingly. (I are an engineer!

We're thinking of a 4 foot tall by 8 foot long camper body, but with an extra large tongue box to make up for the lack of storage (relative to a ten foot long camper). So instead of putting the box on the tongue, how about a ten foot long trailer frame and use the first two feet for the box? Has anyone done this? Any glaring problems with the idea?
For the basic construction, from the comments on this forum, it sounds like Steve Fredrick's methods are sound and what I should stick to, unless there is a compelling reason to deviate. I will probably skeletonize 3/4" ply rather than use one-by pine for the cores of the walls. I've never worked with fiber glass, but it looks like something to learn--perhaps by building the tongue box first, for practice. Not sure why, but I like the idea of painting the camper with automotive paint, perhaps to match the silver and black color scheme of the Jeep.
Learned about the PD4000 power converter/fuse box on this forum and that seems like a good idea. We'll probably use all LED lamps, and mostly stick with 12 volt stuff. Charging the battery will be via the TV, and the converter when shore power is available. We can save the solar panels for a future upgrade, and see no need for a generator for now. To get from New Mexico to New York in the Summer we may want air conditioning (for use when shore power is available). I like the ideas of the folks who modified window shaker air conditioners to use the flexible intake and outlet tubes, and might try and copy those, or may spend the money for a Cimate Right or similar.
I was all for buying doors, based on some comments by folks who built theirs, but looking at the cost, we may go the other way.
The tentative plan right now is to design the camper this Winter, and have the trailer frame fabricated, and then build the camper next Spring/Summer. I'll post pictures and will, no doubt, be asking for advice!
Thanks

Tom & Shelly