[vettestr]

Paul,
I would glass in the opening about an inch smaller than needed and then come back and trim the hole as needed. Blend and tapper your repair back into the body an inch or so from full thickness to nothing for a proper repair.

Use resin and mat or cloth for this and not kitty hair. It is tough to do a surface repair with kitty hair and not get air bubbles with this stuff and is more of a filler or bulk builder.