Theo,
On our Kimberley trip we carried everything, and if we where going again we do things very different.
We don't have any walls for out KK and we have never looked for them, if it's windy for a night you just make do. As for the draft skirts, we had all of them on our last camper and never ever used them.
We take 2 camp ovens, a small one that fits inside the bigger one, both can double up as a pot on the stove if needed.
We don't take a plate for the fire, as there is a lot of places a fire isnt possible.
The matting we always take, but don't often use. We would use it if we where in one place for a do few days and the ground wasn't very good, but I'm always in bare feet anyway......
Cheers matt