One of the best references for a cargo trailer conversion project is the Cargo Trailer Conversion section of the Teardrops n Tiny Travel Trailers forum. There is an incredible amount of information and numerous detailed conversion projects. My project is pretty basic compared to many of the projects you will find in the forum.
Teardrops n Tiny Travel Trailers (just a sampling of projects)
Gadget Mans Adventure Trailer Photos
Chateau Le Cargo. "Done..with pics to prove it"
Glenlivets 6X10 cargo toy hauler conversion
Introducing my 7-14 v nose conversion built 5 yrs ago.The SQUARESTREAM
West Coast 6x10 V-Nose Conversion
Other Cargo Trailer Conversions
Reference
Desert Dawg - Electrical System
wesleggett.com rv - general articles on RV topics
Cargo Trailers
Cargo Trailers - Colorado
Parts
Best Converter RV Electrical Supplies
Small Commercial Campers
Tiny Cabin Haulers (Cargo Trailer Conversion)
DIY Campers
How to Build a Lightweight, Homemade Camping Trailer with Pop Up Roof