So this might not be too helpful but there are a couple add-on weapon mods on this site.. not many sadly but if your looking for some code to the stuff with it could be handy to start there? I would recommend you use the minigun aim animation though since that'd probably be the closest you can get to holding the hose properly.. if your looking for help with the modelling I can't help but hey I hope this at least gave a tiny bit of insight