I designed a mount that overhangs the 20x20 mounting to hold a furiousfpv camera and a TX03 vtx.

The camera isextremely snug, you can size up or maybe cut a slightly larger hole.

I made this for the Hoverbot, but will work with any 20x20 mounting. This is specific to the furiousfpv camera tho - its one of the larger lenses on this size camera: http://furiousfpv.com/product_info.php?cPath=33&products_id=34