Outstanding! I'd hit that hard! Gotta say, I love that SM set up. I'm still debating on whether I go with a stone/fixed version or a mobile set up?
Wooden skewers are your friend. Putting a few through the loins lengthwise and then onto the the rotti prongs will keep them from flopping over.
I've used long, steel skewers with racks of ribs to accomplish the same thing. The skewers will keep the racks straight and the rotti prongs do the turning. Easy, simple and low tech. But gets the job done.
Bob