Unfortunately, neither am I sadly (not that I possess the plans for either class for that matter), although I too would love to see Westrail's final two loco classes in Trainz (before the great sell off and resultant name change to ARG).
I suppose you could try reskinning a NSW 82 or 90 class into Westrail livery as a 'close enough' Q, which would be a much easier job than building the proper thing from scratch. But it's not the same of course.