Interesting. But I think two props could be more foldable and compact than four. and easier. see attached sketch.
Also if two bigger triple props produce twice the thrust of four smaller double props, then at half power they can produce the same thrust, and, since there are now only half the number of motors, the combined effect would be 4x longer battery duration. ie 80 minutes with the light setup instead of 20.
Am I way off?