Yes, I've seen the Kaskin guns a while back and it inspired me a bit.
A few years ago a bought my Father a semi auto (rapid fire) wooden rubber band gun. Fun, but not very accurate.
When I saw the Kaskin gun... I thought, hey, I could make that, no problem!
Here's another one a made a few months ago... and it has a laser sight
It's sighted in for 12-14ft. About the length of my living room.
Again, it's all about the rubber band and how you load it. The laser is cool but it really takes the marksmanship out of it...lol!
Fairly easy to make if you have a metal bandsaw, drill press and a few files.
M