Randy that sound like a great idea, I will check it out and and see if I can add anything.
Randy I set the top of the doors 1/8 inch lower than the spider, I used a built up gasket to simulate the height, when it comes time to to install the gasket I have may different types and height to get the doors to fit. The main thing you want to do is get the door to fit the spider perfect when the door is installed after its been painted I will adjust the door to be 1/8 inch heigher than the spider, then use the latch to pull the door down when its closed. I do this so that there is no chance the door can sag and hit the spider as its being shut. Many times in the past I have adjuste a fiberglass door only to have a customer come back with a chip when the door expanded in the heat or just settled into its new home. So by leaving the door alittle high, this is insurance that you will not a problem. If after a few months the doors does not move you can always lower it but the only time the door would be high is when it was opened and there is nothing to gauge the difference in height.
Ron Randall