i place beads of food coloring and cream on a flat surface and then drop a drop of cream onto them. so that's the commercial side of things. you just cut and then glue fabric to the inside of the envelope – so easy! an example of this is the falcon heavy, which is a rocket that uses two falcon 9 boosters that are placed on either side. if you're looking for a "good dentist", why not get into a "great" one? if you are dealing with a small private company (i.e. "all inventions start as, just an idea". 