I can only say - Great site!!!! -
I like everything about ancient times (though being really happy about living nowadays, even more the more I get to know about ancient times), especially reconstruction of ancient stuff to see how it works. And slinging is something that has been done for a really long time by now... Also I find it really it really impressive that one can cast an object so easily so far with such a cheap equipment (With the material I bought for 1 Euro I can build 10 slings).
I haven't been slinging before I came to this site, but now I tried it and like it a lot. So, finally, thanks to the maintainers and all posters of this site and I am happy to be here.
By the way, has anyone built a trebuchet? I think this is related to slinging as it uses a sling, too. I think I am going to build one one day..