I have a chiller unit for sale it came off a display chill, it blows cold air and is digitally controlled.
It will probably only be effective on a small chill, say 6x2x2, just big enough for 2 roe or one fallow.. You could utilize a defunked dairy cabinet and attach the chiller unit to the rear..
If you hang your carcasses out of the skin you need to cover them in olive oil to stop them drying out...
If anyone is interested in the chill unit then send me a p.m with an e-mail address and I will send you picture..
regards
griff