I see one area that definitely needs a rework IMHO - the shape of the pistol grip section. Looks clunky and pistol-ish as is. Which SHAPE below would you prefer - the funky twist or a design with nice flowing lines (as best I could alter it)?
The forearm removes with a single lever (shotgun style). The small, circular piece at the top front of the hammer is a secondary safety. Rotated forward - no possible contact with firing pin.