WOW, I'm glad I discovered this thread. JW, that's an incredible firearm, and an awesome idea. I'm a sucker for odd/unusual, and I've just had to add another gun to the "bucket list".
That carbine takes the cake though, it's possibly one of the most beautiful firearms I've ever seen. I've always wanted a revolver carbine, but no one made one(until Rossi recently). Add to that the mutli-caliber capability, and.... oooooooh, I get the shivers.
I'm interested as to how you got around it spewing hot gases without either, A) a "blast shield", or B) using a gas seal like the m1895 Nagant.
Also, kudos for being willing to answer our questions, that's not something you find very often. I'd love to learn more about these. If you get a website up and running, please let us know. And, if you ever get back into producing these, I want one.