MHO, it would well work if the top cover was pasted with a white piece of paper so that the flash hits it head on and bounces down and out thru the clear areas on the sides.
Perhaps even a white backing on the back portion of the sides to bounce more to the front....
Certainly worth a try, only thing that kept me away from trying is that its very "obiang" if I ever used it in a friend's wedding or in fact any event.
Here is a shot taken at a wedding (high ceiling, tungsten lighting), using a largish bounce card I cut from plasticard that can be purchased from a art shop or plastic modeling store. Its about 1/2 the size of an A4.
Pentax K100D, Jupiter9 85/2, AF360 flash