If you do decide to send them your documents, either as a PDF or a native Acad file, (and I would suggest you ask them if the PDF would do), you may wish to consider requiring them to sign a Confidentiality Form that you create (and that your counsel reviews and approves) that acknowledges your copyright to your design and that they will coordinate all efforts with you and receive your approval before doing anything impacting the architecture.
If they or the owner question this, just explain that you are the architect and this is one of your methods of assuring quality control of the project. You are graciously coordinating and conducting all of the "members of the symphony," to result in a great piece of "music."
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Rand Soellner AIA
Architect/Owner/Principal
Rand Soellner Architect
Cashiers NC
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