mine has a chunk taken out of it thinking about replacing any body with any advice or any experience replacing one
or a better way to repair the missing chunk with out replacing i am all ears
the chunk that is missing is right at bottom side of the curve so it is a high wear spot.

Removed one last week using a heat gun.

X2 on heat gun. I heated and used a plastic scraper to get most of the old glue off. Then I cleaned the residue off with acetone, went over the area with scotch bright pad, then cleaned again with acetone and put on new keel protector.

About how long did it take

When I got chunks cut in mine I called the manufacturer. They said to email pictures of the keel guard and they sent a new one no charge. The instructions are on their website for removal of the damaged one and cleanup for new install. Pretty much what Dayne said above. Takes an hour or two depending on how many beers are involved.