Hack away everything along the fender line.
And I did use a hack-saw blade.
You can clean everything up after with a file and sandpaper.
~
Cut yourself a good templet that will fit well.
~
Dont do it mid summer.
IT'S HOT!
~
Use your templet to cut out your thin sheet metal undertail.
~I then drilled and rivited it to whats left of the fender.
I painted mine black on the inside and used undercoating on the bottom.
Also used a black silicone to seal it.
~
While I was there, I installed a tail light converter.
Good luck.
It is a bit of work, but you can do it.
Once you are done, you'll look back and say,
"That was not that hard."
Just take your time.
i