The trouble with fiberglass is that it has different expansion rates than steel. Any variations in hot and cold temps in your location will tend to overcome the adhesion properties of the resin where the repair is a short lived one. You have many options, from making your own patches for the inner door, to reproduction patches, to a completely new door. I don't know what your fabrication skills are, but these threads may give some insight into inner door repairs that may be similar to what you have there. Even though they are of car parts, the process should be the same as that of the pickup truck. If fabricating your own repairs, sometimes it is easier to break down the repairs into more manageable pieces (easier to make that way) and then welding them together:
Inner door repair Door skinsInner tailgate repair Regarding the repair of the outer skin, you may find it easier to remove either the front fender or remove the door from the truck to allow better access to the front flange for repairs. Make a profile template matched to the good door to have a better gauge of where the highs/lows are for more accurate metal bumping.
*edit* Hey Ed...looks like we were typing at the same time!
