Bottom plate for Festus440's LED Skull Lantern

I've printed a couple of Festus440's excellent LED Skull Lanterns and I wanted a plate to cover the open bottom of the lamp - mainly to maximize the available light output through the panels.
I whipped this up quickly in OpenSCAD and printed it in white - and it does increase the brightness enough to make it worthwhile. Then I printed one in red and it added a tinge of red to the light which made the skull panels look a bit more spooky - perhaps.

It's a fairly quick print. It inserts fr