One method for the scale panel lines is to first paint (or prime) the entire fuse with a gray or black paint (or primer). Then, using 1/16 inch wide tape, apply this tape wherever you want the panel lines to be. Then, paint over the entire fuse with your final color. When you later remove the 1/16 inch tape, the initial gray/black paint/primer will be visible as a panel line. Time consuming ...... but looks great.

Bob