This is just an addition to the awesomely designed original top piece from christhechris. My addition here is a base piece for those who may not have the command strip bases to go by.
I had nothing to model this by except christhechris' piece and the picture he posted and it seems to have come out pretty great on my end.
I'm not sure what the best way to lay these out are, but christhechris had their piece on the side, so that may be better, but I haven't tried. I've positioned them how I printed them with support. I'm wary of support as these need to slide snugly together.
Blender, using christhechris' pics and top model as a starting point for my addition, the base.