Glad to see you working away at this, I learned my glass working skills from my early road race days, a necessity breads invention kinda thing, was it the same for you? Great job by the way.
You can save a bit by just using a polyester resin over the tooling gel, usually the tooling gel is polyester based and bonds well to the ploy resin, also tends to be very rigid compared to epoxy, general ya good trait for a mould, Hey just trying to save you a few bucks in hopes you can come up with a better offer on the Flash/Flex combo you want.
Richard