Face palm...
Thanks Jim! That bogie mistake is really silly! The kit provided T49 steel tracks so like you said they probably shouldn't have grousers, that's easy to fix.
As for weathering, I don't doubt the mud but perhaps David thought the upper portion was too weathered. I was working off of this
photo. But this is my first real effort in olive drab so I'm sure it could be better. Now I'll go and fix the bogies