I just made one! I have it in my photo gallery.
Steps I took: First you have to know how you are going to lay it on the cake... you take it from there. To know how big, I took my 12" heart shape mold and put it next to me to eyeball the size of it.
1.- I roll out two sausages pieces of MMF with tylose and shape it as the little hook things that goes into the ears and let it dry, You might want to make it thicker than the ones I made , because mine broke
but manage it to glue it together again.
2.- At the same time I molded by hand the little round piece that is place on the chest; with MMF and tylose again ( you can make these decorations with gumpaste or reg fondant, I just did it with the one I had made) Let it dry.
3.- The black part I made it on the day I decorated the cake because I need it to be flexible. I made the "U" shape first and after the longer one, on the black one I mixed MMF with gumpaste, I need it to be more stiffer.
The cake mold will give you the size you need to make your decoration, just place every piece agains it , or on top of it!!
Tags for my cake is " nurse cake or medical equipment "
I hope this is understandable. Goog luck!