Some comments on that bit, for the benefit of those who might not know how the roads are.
I found Munglinup a really dispiriting place. The SC Highway carries one west from there till Ravensthorpe, when there is sa steep little hill after the caravan park. East of Ravey, the bush is ideal for wild camping. West, it is shit. The general pattern of the riding is set by dry watercourses, in that every so often you have to descend and then grind your way back out, as the road follows the lie of the land rather than using cuttings or bridges. There are some paddocks (fenced fields) away from the road, but the bush in between is largely nasty scrub rather than gum trees and open ground. There are curving flood relief channels gouged at an angle into the bush every so often.
The orad is two-lane tarmac, with a 'pea gravel' shoulder on each side. The tarmac is laid straight down, so the edge is sometimes a step, sometimes a merged slope. There is no hard shoulder, and I remember a couple of stretches where it became a single track. In the pea gravel are reflective posts, normally flat so they bend over and spring back when hit. There are road trains, and the rear trailer often fishtails, especially on the descents to the water courses. Traffic levels generally are very low.
Flies are everywhere. Inside your nostrils, on the inside of your sunglasses, crawling through your helmet vents, and equally common is roadkill, which smells. That sounds like an obvious thing to say, but that smell greets you well before the corpse and stays with you a long way afterwards. You get to know every single stage of roo decomposition, from alost human-looking to bloated balloon to leather scraps over bone. Stumpies (blue-tongued skinks) are crushed all along the verge, and as they mate for life, when one gets killed its partner stays beside it until it too is crushed.
It is incredibly beautiful.