I don't have any I can share, but yes, they get complex.
Since I have multiple clients, and I cannot see charging a client for format development. I end up either biting the bullet for a major account or making it a dumb import. Fortunately I can quickly copy and paste all the annotation from one drawing to another. the last format I made took me more time to get the logo to print right (Bitmap image) than any other aspect of the creation process.