As far as the fenders are concerned I think they are complete:

Maybe just some slight adjustments to fit with the Cab, and the front Fenders need to be bolted to the front axle.
As for the Chassis and Stabilizers, Hydraulic lines for the Stabilizers needs to be added, and I think there are more brackets to add to the Chassis. Every time I look at a reference for something else I see another bracket on the chassis.

And then there is this, a small extra:

@theluthier Does this count as part of my 50% complete?