Gun looks hella fun, but I can't help about think about the following:
Receiver is in front of the trigger followed by the magazine. As a result the gun (with a 18.5" barrel) is going to be a little longer than a standard AR15 or XCR (with the same length barrel). Considering this is supposed to be a SMG, seems like there are better choices. It's still a clever design as it minimizes muzzle clime.
I briefly looked into the reloading cost to reloaded .45ACP and it seemed to be the same as reloading .223. It costs me 30cents/round to reloaded my 223 with 62gr bullets. I do look forward to being proven wrong on this.
For the money, I think you'd be better off buying an XCR or Keltec RFB.
Eh, I'll still buy it when I win the lottery.