Cleon
Legend
The greater ones seem slightly worse than normal stone golems, so maybe CR 10. CR 3 is probably ok for the lesser ones.
These fellows don't have immunity to magic or slow, which are both quite powerful. They look more like a CR 9 to me.
For construction, I'm thinking more in the way of materials and Craft DCs, less in the way of magic. What do you think?
Well if we still have a few spell prereqs that would be acceptable, I suppose. We also need to include costs for a winding sprocket and its power-train, in case it needs multiple power outlets.