<snip> Do you notice sag or flex in the middle of the plexi? Did you support the middle in any way?
If you put the plexi over a glass table top, the glass will support it--no sag.
Glass-top tables are fairly weasy to find in stores or thrift stores. I'll bet, without websurfing to verify, that IKEA has a glass top that can combine with various heights of legs.
The lightboxes (various sizes) I have all have frosted glass surfaces, to diffuse the lightsource, cut glare, even out "dull" spots. All use flourescent tube bulbs as well, for larger surface/coverage, cut down on heat, and be more energy-efficient.
I would pay some thought to height so that you minimize muscle strain in your back and neck: now that I'm approaching 50, I'm much more sensitive to the damage I've accumulated from a lifetime of poor posture and intense concentration. ;-)
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