I'll have a look at the topo maps over the next couple of days. Funny, I don't think anyone here really puts too much thought into how much elevation gain we ride. Rob (Machka's ride partner) has done PBP, BMB, Perth-Albany-Perth, and I think he puts the Giro 1000 route above them all in terms of climbing and the constancy of it all.
Most of the climbs also start close to sea level -- Woodbridge Saddle, Palmers Rd, the Bonnet, Fern Tree/Neika (the ride starts at Parliament House), Silver Hills at Cygnet, Kaoota (which I personally rate 9/10 in the toughness rating) and Merchants Hill. So you are doing a true, all-the-way climb rather than starting at a higher elevation. The only ones don't really start close to sea level are from Longley to Vinces Saddle on the way to Huonville, and Mt Wellington, of course, which on this ride starts at Fern Tree (but you've still go to get back up to Fern Tree from Longley).
The fixie is definitely staying the lounge room for this one. The Fuji gets to tick over 30,000km since new three years ago. A reason to break out the champers, eh?