I don't want to post a copy of the previous rules - don't want to confuse anyone.
The basics are of course real world weather and RTW realism settings.
The start airport is Mildenhall - EGUN and the end is Essendon - YMEN
Mildenhall is where the race actually started. The location in Melborne used for the end of the race is not now an airport, may have never been. But it is unlandable in FS2004, FS2002 or FSX. YMEN is close.
This is a good overview of the original race -
http://en.wikipedia.org/wiki/MacRobertson_Air_Race
There were five required stop - Baghdad (ORBS/ORBI), Allahabad (VIAL), Seletar (WSSL), Darwin (YPDN) and Charleville (YBCV) - the last four are the actual airports used in the race, or at least very near the same locations. The airport in Baghdad was close to the river and much smaller city than the FS2004/ FSX airport. In FS2004 the airport is Z15M, but it is not in FSX. You can see in Google Earth that Muthenna is a rail yard now.
There were 22 official fuel stops scattered along the route.
The last SOH race had to be in period specific aircraft, such as the DC-2/DC-3, Boeing 247, etc. You did not have to fly an aircraft which flew in the actual race, though I flew the Dragon Rapide and others flew the Lockheed Vega and Dh-88 from FS2004.
The last SOH race required the use of DR and NDB for navigation, no GPS, no VOR, no ILS - though ILS is really not an issue because most of the required airports do not have it and very, very few of the authorized fuel stops.
Since there were not pressurized aircraft at the time of the race, there was an altitude restriction. It did not impede the route in any way.
Those were the basics.
If you can average 225 kts ground speed - the base route is 43 3/4 hours flight time long and 9,832 miles.
http://gc.kls2.com/cgi-bin/gc?PATH=EGUN-LFPO-LIRA-LGAV-OSAP-ORBI-OIBB-OIZJ-OPKC-VIJO-VIAL-VECC-VYYY-WMKA-WSSL-WIHH-WADA-WATT-YPDN-YTNK-YCCY-YBCV-YNRM-YMEN%0D%0A&RANGE=&PATH-COLOR=red&PATH-UNITS=nm&PATH-MINIMUM=&SPEED-GROUND=225&SPEED-UNITS=kts&RANGE-STYLE=best&RANGE-COLOR=navy&MAP-STYLE=
The actual routes will have to be longer due to several items. Only a few aircraft like the Vega and the Dh-88 can made the longest legs without fuel stops.
I believe these were all authorized fuel stops -
http://gc.kls2.com/cgi-bin/gc?PATH=...s&RANGE-STYLE=best&RANGE-COLOR=navy&MAP-STYLE=
Note that some of the designators are different from FS2004 - especially in Indonesia.