I wouldn't think it has anything to do with the RAAF. There are a mix of really good guys and not so good guys which come from there, like any organisation (born & bred QF managers are no different). The "complete pricks" I know who are ex-RAAF were also complete pricks when I knew them in the RAAF! The personalities don't change. Just the job.
If you can get a kit which can be built & certified under FAA regs (eg experimental or whatever) CASA are very likely to approve it here. Mine is coming with FAA paperwork already stamped, and I've had advice on multiple fronts that the CASA certificate won't be a problem at all.