Rich,
I've had decent results making mold shells for casting out of 0.093 kydex. That thickness seems to produce excellent internal definition. I just cook it longer in my heat press, since I'm not worried about glossing it.
Best results from using a membrane free vac former, but it works fine in a standard vac press too.
I've tried AdTech F100 resin, and the alumilite vac 25. They both produce good drones. I found the F100 a bit easier to modify or machine afterward.
Sent from my iPad using Tapatalk