Man I don't claim to be any expert, but that all looks real good to me! Good luck my friend! Happy sniping
Edit: I just noticed the pdi hop up unit you linked is not the aps2 hop up. I don't know if it matters or not, but just for interests sake, compare it with this one...
http://www.redwolfairsoft.com/redwol...ruzen_APS2.htm