Not to take away from Zorn in anyway, you might be interested in a new design coming from High Rock Molds. I just talked with Kyle at High Rock Molds, here is the info he gave me:
It will be a "small scale" production machine, cost will be $17k - $20k and molds will be $1000 - $1500 ea. Cool down time per mold will be approx 30 seconds. Mold costs are reduced because they don't have water ports in them, instead the plates that hold the mold will be cooled (there's a technical name for them, I don't remember it). Kyle could explain it better then I can but I think you get the idea.
This system will take up 6 feet x 6 or 8 ft and be on casters so you can roll it around. This will be air fed rather then a pump and will be designed to use a 5 gallon bucket of plastic at a time. For more info, check out his facebook page: https://www.facebook.com/pages/High-Rock-Molds-LLC/1592179457679983