The ammo rack came together well. Used leftover panzer iv wheels and plastic strip for fake transmission parts. This won't be very visible thru the open hatches, but does the trick!
Since I don't plan to use the kit's rubber-band tracks, I snipped off a piece and glued it under the grills to look like something "mechanical" is in there.
Working on the main gun, I added a short piece of plastic tube on the back of the barrel to make it longer. I want it to look like it's running through the ball gun-mount, not just stuck on it.
After letting the first base color dry for three or four days, I wet it down with tap water and a drop of "wetting" agent (liquid laundry soap) to help it flow evenly. While it was wet, I applied salt.
A lot of the salt comes off during the painting process, but after the second coat is dry, the remaining salt is rubbed off. A little water helps melt the salt.