Sorry, this is not a real woodworking question but not really too much off topic. This is an exterior fiberglass patio door that the bottom 6" has decayed. The door is still in nice condition other than this decayed area. I'm trying to figure out if I should repair this or just replace it. To repair I thought about machining a piece of pressure treated pine to fill in the rotted out cavity. I think there are some exterior wood fillers on the market that are used in porch repairs on columns and rails. How would you repair this? Sorry for photo being sideways.
door repair 1.jpg