quick story. i was commissioned by a friend to "go crazy" with a MLP 40K theme.  so after a bunch of concept sketches i settled on making some 3d models. starting with luna and celestia themed space marines.  i tried making my proportions closer to the 2nd edition space marines but im going to make the bolters more like the 3rd edition 
my friend was ok with my posting the base marine for anyone to play with.  he has a simple rig and UV maps but i don't think it will 3d print very well as i made it more for drawing and rendering 
https://www.dropbox.com/scl/fi/0d0tvgdb31ta41dcza8z2/base-marine.zip?rlkey=wdgtl200hunckahb7zlm6g5t7&dl=0