On william cheung's webpage, thier is 6 orso dummy clips, How much of these drills is his actual dummy set, Also what you learnt from your sifu, Is thier variations within your guy's lineage.
I would like to compare with the yip man wd book by his son, would have asked on pm but you dont got that capability.
I would prefer if you would answer on pm, as this isnt a general wing chun question, just my curiousity.