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Hi John,
You need the interface only if you can't print the large parts of the fuselage (front 202, back 190)
The fuselage parts front 1 and front 2 needs the interface to connect both parts.
The interfaces are supposed to put them fifty-fifty in each fuselage part. In this way the parts are aligned and easy to glue.
Before gluing you should mask the edges of the fuselage with tape to keep them clean from glue.
After that, you must cut out the front interface in the range of the opening.
The same has to be done on the back fuselage but I didn't sliced it yet.
If you can't print the large wing parts, the order is as following (from middle to the right side):
wing middle right 110
wing servo right
wing left right 110
wing left right 110
wing end right