I am an AME and if I found that you had in any way tampered with an aircraft that had my signature in it's logbooks or on the CofS then I would stuff that chain link for link up
.
Rather buy a pair of binoculars and get the word out to the flying comunity that you are indeed a private field, rather than endangering what by all accounts looks like a bonehead who is quite likely to hop in and fly off with as much regard for a preflight as he has for your privacy and safety.