Never done this before Rich but looks like a pretty good setup. I think I'd give it about a 12" drop on the chain welded maybe 10" apart. Will the link go thru the rebar? If so you could just run the rebar thru and then spot weld it 10" from left side to right side of chain with about 12" between steel plates depending on the distance. JMHO???
Those little aminals look kindly cute, and prolly fun to shoot!!!LOL