I'm a bit pressed for time, but this is just a note to say that - I MADE IT!!! WOOOO! :D
It was absolutely freezing cold, and there was a monster of a headwind almost all the way down from Goulburn, but crossing the ACT border, seeing Black Mountain and the Telstra Tower come into view, and riding up to the front door of Parliament House, just as I'd imagined, and being able to stand back and admire the view made it all worth while :).
Longer update coming soon once I can get a better internet connection than the Canberra YHA.