Jim:
A bit late but hopefully this will help.
There are probably several different equally effective ways to approach hanging the doors. This is how I would do it. Hopefully this makes sense.
The door connection. Using the stainless tube will simplify the installation, as detailed in previous blog / book. Where the stainless tube passes through the fiberglass the hole needs to be enlarged so that the tube can be adjusted fore and aft. Making the hole about 3/16 to quarter inch larger should suffice. The holes for the three screws that hold the top and bottom plates need to be elongated as well. This will facilitate adjustments of the top and bottom plate. Keep in mind a tiny bit of movement of the plate will make a significant difference in the movement at the opposite end of the door. But don’t drill anything yet.
The chassis connection. The chassis hinge should be secured with four bolts, but for now just use two. Two of the chassis holes will need to be enlarged so that the entire hinge can be moved about. Use a good sized washer on the back side.
Once the hinge is mounted with two bolts, roughly centered in the enlarged holes in the chassis, set the door in place. Use spacers and tape to support the door. With the door temporarily secured in its intended location, mark the spot where the stainless steel tube will pass through the door. Only then should the mounting plate be installed on the door.
On my GT, the hole on the door ended up about 1 ¼” from the leading edge.
Adjustment. As noted in the previous blog / book, most of the adjustment is made at the chassis hinge, not the top and bottom plates on the door. Spacer plates will be needed for proper in – out location and rotation of the hinge will be needed for up – down movement of the back end of the door. Spacers between the bottom of the door and chassis hinge will adjust the height of the leading edge of the door. One is working in three dimensions and the door may have to be removed many times to add or remove spacer plates and adjust the hinge before things line up.
Once the door is in the final position, drill the remaining two holes through the chassis and bolt the hinge in place. There should now be four bolts connecting the chassis to the hinge. The last two bolts will make any movement of the hinge impossible.
The bolts holding the plates to the door can be used for small final adjustments.