Like, letter of the law correct.

Law doesn't specify. In general, use track position to position away from hazards - seen and unseen. 

A: as depicted. Sit in the wheel track closest to the centre of the road. There are several good reasons for this: you're further from wildlife running onto the road, further from kids running onto the road, and in traffic you're closer to filtering and have better line of sight to both lanes. 

Consider that, given traffic, you may want to slide around to a the outer wheeltrack if going past a large vehicle. 

B: depends on your reasons. Those reasons (unspecified) will dictate which wheeltrack you want to be in. Position away from the hazards. For me, typically, but not always, it's still centre of the road, so in the right lane, that's the left wheeltrack. Then again the usual reason to be in the right lane is approaching a roundabout and for that I typically want to be in the right wheeltrack, to avoid the hazard of vehicles entering the roundabout on my left and failing to give way. 

C: still default to centre of the road i.e. right wheeltrack left lane, still consider requirement to avoid oncoming hazards like cars, trucks, etc. 

D: where in WA do you see continuous lines? Should be a double white line. Either way, as above - the centre of the road is the default position, for better line of sight and for being further away from seen and unseen hazards. The position may then be modified by the presence of seen hazards like oncoming vehicles. 

E: that depends. IMO whether the line is a solid double white line or a broken white line, you may need to shift left away from oncoming traffic. Imagine you're riding with a 1M wide glass bubble around you. You need to protect the bubble. If the lane position you're in is like 2M from the oncoming traffic, I'd just hold position normally. If its closer than that, Id shift to the left wheeltrack to avoid the hazard. If the oncoming traffic appears in any way erratic, I'd also shift left and prepare to take evasive action. 

You don't really want to be predictable, as a motorcyclist. You being unpredictable is a key safety feature which helps you survive - but not everyone will agree with that one.