Great video, Jim and Katherine! I predict that you are going to have to enlarge your business again, very shortly! I know that I, for one, am planning to get one of your Colonial kits later this year - if I can stay away from Doctors and hospitals! Large caliber for me - .58, .62..... Since you don't offer a 106 mm yet.
I used to do a lot of investment casting when helping a jeweler friend of mine. But I think the tings, etc., were considerably smaller that your items. Still, it was fun, and a good education in the process. Couple times I wished we had cast in brass instead of gold. But, you could always melt your rejects and try again.
Good luck with your business - you really fill a need in the ML crowd.