Sorry it took me so long to reply, I was...Um...Distracted by your avatar LOL
I'm designing/building a transparent floored shooting platform myself. I'm using a 4x8 foot sheet of 1/4" clear plexi, supported uniformly around the perimeter by an angle iron frame. In my center support shadow casting tests with lighting from below at a close proximity, 1/16" cold roll round stock (tension welded to the perimeter) doesn't cast appreciably, neither does the main element from a dead bedspring. Implementing either of the above for relatively quick setup and breakdown, however, is proving to be something of a challenge (though I'm leaning toward the cold roll route, barring tests with separate vertical supports).
When I have it completed and acceptably functional, I'll post the print for it (and results).
Cheers!
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