novel
There is something attractive to that little project, if only that I've not seen it before.
That said, I shoot anything with a stock, better than anything without, and if I am trying to plink stuff to eat, cause I have to, I want something I can shoot well. Probably starve anyhow.
So that little rig gets put in the novelty column as a fun gun. I'd not want anything electric, (short of an Aimpoint), even with extra batteries, on a survival gun either, without a set of backup sights.
Still, as a novelty, when I saw the pics, I thought "now that's cool".