Ugly gun anyway..better option avail,
22s don't have barrel length restrictions, but they still have OAL restrictions to remain NR. The way I see it you gain nothing from a bullpup 22 because of that, other than bad triggers and jams that are more awkward to clear.
If you want a short NR 10/22 there are already options for that.
"We don't take souls, we leave that to wives and girlfriends, but we can do a layaway " - Grumpy Wolverine.
If you need religion to have good morals then you don't actually have good morals.
I have a Tanfoglio Appeal bullpup 22lr. It hasn't jammed once. X95, was pretty quick after some practice and muscle memory. For steel challenge, it's frigging quick.
You aren't gaining much of anything velocity-wise once you get past ~12".
http://www.ballisticsbytheinch.com/22.html