There been a few builder that used CAD and a CNC router to cuts parts out for a camper. Most of them had a friend do it or use their work place CNC machine.
I know I have a Tub of parts in the den, slowly collecting for a few years so I can build my own small CNC router one day. After that I will do what all home CNC makers do with there first CNC machine. Ues it to build a Bigger one. Ha hahah