Looking really good.
I'm doing bodywork now and was working on the back of the cab next to the window. What I do is put the filler on and then let it set but not completely.
I take 80 grit net paper on a soft block and block it into shape. This makes it easier to shape and I don't have to sand as hard, which my shoulders cannot take.
I also use a cheesegrater for shaping and quick knockdown.
