Watch out for the bull dust and if you have not gone there before be mindful some of the water crossings would be over the seat if you did not follow the bank.
If you are going to go up the centre its just a dirt road.
I went that route in 2009, from Darwin on the dirt around the gulf, Cape and back including the Creb track in the dark and wet for 8100 kms in total.
Make the most of it as the tar seal will be to the top one day....... I would not do that trip on my Africa Twin for all the tea in China.
On the way home and only 800 kms to go to Darwin.
Enjoy the trip.