Mini Ballista

Mini ballista to destroy all who stand in the ways of your world domination. I made it for engineering class as a part of a challenge to see who can get the most downloads (SO DOWNLOAD IT). I made it on Autodesk Inventor 14 in about 2 weeks.
I've posted the assembly file as well as all of the parts so you can see where the pieces go. I've also posted pictures of the pieces and highlighted them in the assembly.
When assembling the ballista you will need super glue or hot glue, string, and a ruler(maybe). For the pegs, you can either print them or use a stronger material, your choice.
PS: The model thumbnails came out weird but you can use the thingview to look at them. Also, there are some offsets on some constraints, if you can't find them tell me.