you make fair points. Rules are original engine, gearbox, frame to start. Spares from like era in case of failure. Only modifications for safety reasons...so non-clincher tires/rims, headlamp, tail lamp and brake lamp usually are led's runniing from flashlight batteries...and yes, brake upgrades are allowed since the run traverses both the Appalachian and Rocky mountains. The run is nearly 4,000 miles over 17 days, averaging nearly 250 miles per day (one day is a rest/maintenance day). Some guys are purists and run original (except lighting)...lighting mods are the only "required" safety modification.
The london to brighton pioneer run is only a single day 50 mile run from what I gather. Are there any pioneer runs in Australia? With the size of the continent, I could see a formidable run from coast to coast there...probably similar to a usa coast to coast distance.