Then I cut out a little plate and welded it to cover up the hole that is left towards the rear. I just use a piece of cardboard for any shape I want to cut out. Then with a knife I get close with the shape and then use a pen to make any notes on it or small lines that I'll need to cut with the grinder.
Here you can see all the sections collapsed and tac welded up into the out fender. Pretty smooth so far eh?