I think you have grabbed the wrong end of the stick this time. It is NOT Paul's handiwork - He is just commenting on the design as requested. In one of the threads on this same bike he makes it quite clear he is not a fan of this inlet. The photos are from a current Aussie Gumtree listing by the creator/owner of the bike. He says it is the last of 3 made at the time and is for sale for less than US$100.
Make him happy and buy intake, been on sale since Dec last year, I think he finally had it sold when I enquired about it.
Should be no more than US$150 posted to the US from Perth, Western Australia.