I've completed the initial airbrushing and have attached the wheels and rear fenders. The tires were finished by applying a series of washes using Vallejo Model Color Black Grey (70862) thinned with water until the desired effect was obtained. At this point I have also airbrushed Vallejo Gloss Varnish (70510) over those areas thatg will receive decals.
They're not shown here, but I have also nearly completed the turret and gun assembly. Since the M36 gun mount was not used on the vehicle I am modeling, I've decided to mount the M2 machine gun directly to the rear of the turret.
More photos to come after the decals are applied.