This thread seems to be going around in a continous loop. How ever, I would like to know why we really need to adopt the "American system of airspace design"? I have just finished reading an article entitled "Blinded by See and Avoid" (Business & Commercial Aviation Jan 2007)
Part of the article lists the number of mid air accidents which have occurred over the past few years, and even a small percentage of such accidents occurring in Australian airspace would create a very public out cry.
We are Australians, let us design our own airspace needs (which meets ICAO requirements) to suit Australian conditions. Design criteria would take into account that Australia has only 20% radar coverage and provide some protection to RPT aircraft operating into non controlled airports. The concept of E airspace out side of radar coverage is one of the most flawed concepts of the current airspace model, as it certainly doesn't work in the USA, where their is greater radar coverage, yet a large number of mid-air accidents.