James,
Check out Joanne's
Desert Dawg teardrop construction website. Her off road teardrop's profile is similar to the one you're proposing. She documented the construction of her teardrop very well, with many pictures, and Joanne readily mentions her flubs.
One thing to keep in mind is that ideal teardrop electrical systems have improved considerably in recent years. So, many electrical components used in the Desert Dawg take too much expense and effort to put together now a days.
LED lights are now very affordable and readily available.
Solar power is now very affordable and nice to have. It frees you up to camp longer (boondocking) away from hookups, and can lower camp site costs.
AC/DC fridge freezers like a
TruckFridge 41 have become more affordable too. Solar power and a chest type fridge/freezer can add a lot of camping freedom and enjoyment if you plan and budget for them.
A power center like the
Progressive Dynamics PD 4045 also saves hours of effort to piece together a battery charging and power distribution system.
It will be best to custom build your off road teardrop's trailer frame, too. If you do not have the welding skills and tools ask local welding shops for an estimate. You may be pleasantly surprised at the cost and end up with a much sturdier, custom sized, trailer frame.