Thanks for the idea. Here is my version.
3d file from Thingverse, 2" blue foam, two halves no slicing, 3M spray glue, Plaster of Paris for smoothing, primed and stone paint.
What I like about this is the process from start to finish. Once you understand how to slice, connect and finish 3D models, then your only limitation is between your ears and the size of your bed.