I built this flash grid with straws, hot glue, a cereal box, Gaffers tape, elastic strap and velcro. This is pretty easy to build but it takes a little time.
You can build the same thing out of a corrugated box a little glue and a rubber band.
for more info see the strobist web site, I don't remember the link to site that led me down my path.
This is was designed for and mounted to a viv 285, no velcro applied to the flash. It fits the 360 good and should work just fine on any flash head smaller then the 285.
__________________