Oh sorry - just looked at the pics. Ok, they look well centered and appears he kept the stock centering pieces. Not sure, but maybe the centering pieces have a lip to still sit on the MCPCB. You can delete them if you like.
Actually this could be why vinh is doing only 2, and called it a "Pain in the butt light to build so I decided to only build 2. " 
Makes a lot of sense...
Thanks, Tom, for your valuable observations. More good news: The HK90 that I ordered from this group buy ten weeks ago suddenly has surfaced: its tracking number suddenly went from no information, to materialized on Earth, at a location near me. Not only that, but on its way to me, arriving soon, too!
Yea, that's good news! I dunno what happens with crazy shipping - looks like it took bout 6 weeks for shipping :FACEPALM: