I'm currently in the process of building a Sherman Crab using a Tasca M4A4 and Resicast conversion set. Despite numerous searches on the net and through some of my books, I have been unable to find a definitive answer regarding the bow gunner's .30 cal. Was it left in place with the flail equipment fitted? If so, would it more than likely have a canvas cover over it? If it was removed, what, if anything was used to cover the hole left?