That’s a nice setup. I built something crude but similar (cardboard and tin foil 
) just like the one @Jory made.
One thing I have wondered was not necessarily about UV exposure, but the heat factor. If you have a small item to be cured, say the size of a golf ball, does it cure just fine being closer to the bottom of the box? I have various sized pedestals I created for mid and small sized items so the actual item is way up closer to the UV lights. Or sometimes I just take the nail station off the top and put it right on top of my item (with the original platform inserted).
Do you think that is overkill? Would a tiny item cure without issue so far from the heat source?