crlush... great panel. That is exactly how I re-did my panels many, many years ago. I did it just like body work. To bridge a big hole, scuff the back of the panels, soak a piece of fiberglass in the fiberglass resin and bridge the gap. Fill it from the front side with bondo, sand & re-paint. Thank God I didn't have any texture in my panels where the cracks were...the smooth parts are pretty easy.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"