As I've said before, a machine on this scale would be about $10,000 - $20,000 to build. A wider machine would be at the upper range of costs. I would go for an 13" machine to allow for sizes from 12" wide by any length. I would design it with 2 coating stations to allow for rollup and longer lengths of film to be coated. It would probably double the cost if you have 2 coating stations.