OK - I have the doors 'trimmed'. it turned out very good. The basics are a nearly 2" waterproofing foil tape covering the 'raw' area, with some 'L' channel 1/8" aluminum bar covering the bottom and side flat areas. Pictures below:
Basic issue - good new door, not trimmed, delicate material left exposed:
Basic fix is to take some Waterproofing Foil tape, a little wider than area to cover (a little overlap) goes on with a very aggressive adhesive.
After putting down the foil, all the way around the hole, you bring out the big metal (1/8" L channel aluminum bar.