Following on from my post above, I used some textured old english white mount card to make something like the Lumiquest midi bouncer.
The reflector is 8" along the top edge, 5" along the back edge and ~4.5" deep. Tests showed that I was loosing ~ 2 stops compared to direct flash, but leaving the Metz on Auto and it seems to get the exposure about right. I did have to adjust the white balance from the flash setting of 5900K to 5200K - I guess because my card is not true white.
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