if it is just gap,.. then sanding blocks etc will help get it more uniform. I had a problem with the partial built kit I bought, with the
hinge pin "(very) hard to install". Closer inspection revealed that the joint had been "forced" and it actually was pinching the cowl (front to back) to make it fit. (you could actually see a inward dip in the cowl below the hinge) I ended up having to ...