I also found the balance pipe to be a very weak point (sticks, tall grass, etc. can easily cut it) and I put a temporary protection plate till I get a better one done (see photos).
This plate already saved my life as I was deeply bogged in mud (up to the chassis) when I was in the red center last April/May.
As far as clearance between the tire and the fuel tank, there is not a lot if the axle moves up. The tires are standard size.
I like the fact that the tank is gravity feed, but creates a problem that can get you stuck anywhere in the bush, all it takes is a stick and you loose all the fuel.

