In my previous work with fiberglass car parts, I'd cut them with a rotary saw (don't know the exact terminology in english). Since masks are considerably smaller then a car part, I'm planning on cutting them with a dremmel saw (and also do alot of edge sanding).
Future plans, like I said before, would be to add more color options, add art options, add full face options, buy better tools (pistol painter, instead of brush, etc), hire artists for some video game or movie masks, etc.