In the past I’ve usually made my own mud from various mixes… paints, sifted dirt, foot powder, etc. I would bind them together with thinned white glue or Future and could mix whatever color needed using paints. In this case I used pre made mud texture stuff from AK and Mig Ammo. I also dust on some pigments or paint colors with my airbrush to adjust the tone. The biggest change that I’ve added is adding the textures earlier in the assembly process before the road wheels and other items are installed and can get in the way.
This is one of my homemade concoctions of paint and dirt
But as you can see here, it’s much easier to do this stuff in sub assemblies.
You can look through this gallery here for seeing how the progress went on this build