I don't think you'll get your ride guide until March Baalzamon. I'm just correlating the google map to the GWABR ride guide and this might help.
Day one is the same as day eleven of the GWABR, day two is the first half of day twelve, then take the Capel, Donnybrook road. I have a topographical map of day three and it looks like a good option to the SW hwy.
From Donnybrook, East along the Preston River Valley towards Lowden, after five km, south on the Kirup road, the first climb to 250m will bring you in to east of Kirup at which point the ride heads out to Grimwade and a slight climb to 325m. Before Grimwade at 300m, the ride turns SW to Balingup with the descent down to the Balingup River Valley. At Balingup, a short loop east then south into Greenbushes, the second climb to 300m.
East from Greenbushes to Hester again at 300m then south to the Boyup Brook Road and the descent into Bridgetown Showground at 150m.
Day Four goes SW from Bridgetown down Mokerdillup? Rd to Donnelly Mill then follows the reverse of Day six GWABR into Manji.
Day five ,looks like it goes out along starkies Road looping back to Jardee, a short excursion on SW Hwy then SW along Channybearup road to west of Pemby and looping back through Beedelup on Stirling Road?
Day seven out of Pemby goes out through Eastbrook, Pemberton North Road, Diamond Tree Road then Eastbourne Road to the Hwy into Manji then west out through Graphite road to The Vasse Hwy and North into Nannup.
Day eight and nine are the same as days seven and eight on GWABR.
The route seem to avoid the big hills like Hester Hill but at the expense of a greater distance. A fair trade I think. These are my best estimates at the route from the info given and the Lands department maps I have
Does the name "Pavlov" ring a bell?