james is right, make the entire front of the enclosure out of a white piece of plexiglass or lexan,
plexiglass cracks easy so best not to use it.
if you cannot find white, get some frosted contact paper and apply to both sides.
your desing of having a gray panel and then cutting out openings for a smallish softbox is more time consuming and gives inferior lighting.
also all 3 of your designs are not what I recommend.
id' recommend what james says, one monolight from adorama for $80 or so.
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