starwrek , The vent tube is a short length of brass tube soldered to the vent hole of the carb diaghram cover, with a length of hose slid over it . The hose is usualy routed to the inside of the fuselage .The velocity stack can be purchased from 3w ,or many other engine suppliers . The stack can be straight or 90 degrees. I don't have any pics but I am sure there are a few threads on the subject here on RCU