In the pictures, the two straight pieces you have clamped to the fuse, are those the fuse sides or just pieces of wood or something you clamped to see how far off you are?

From reading your post it sounds like you have already built the fuse, glued the top, bottom and sides together. I think most people that have answered so far are assuming those two pieces you clamped on are the fuse sides, so they say you are ok and it will turn out fine once glued. If I'm right and the fuse is done, I do think you have a problem and need to straighten the fuse out.