Concerns
This is a good idea, but have you considered that you may be called into court to testify? I am a police officer by profession and I personally hate going to testify in court. Divorce proceedings can be really nasty (been through one) and you will be dragged in the middle. Just decide if it's worth the time and money.
Also, what do you mean by verified documents? And from experience "chain of custody" is a big thing to consider. There is alot of case law in regards to it. You will need to be well educated in case you are asked in open court about your methods, etc.
Good luck!