Modification of https://www.thingiverse.com/thing:744504
I used Sketchup to manually (painstakingly) split it into two halves (front and back). The supplied model is identical (size, etc) to the original Thing, only split in two.
I plan on scaling this down 50% and using with the Adafruit Gemma to make a smaller version of the original Flora design.
There seemed to be some problems with the original "back" and "plate" STLs. @DracusMage graciously provided repaired versions which I have uploaded. Thanks!