Please Please consider some kind of unique serial number to be placed on the board either at manufacturing stage or post production.
because you'd have to bought all the components on a roll and supplied them with all the components before it was run through the machine(s) to build up the board, please please from now on, consider getting Serial Numbers introduced if for not other reason except to prevent clones..
you feed in your serial number and outcomes the details of the board, where it was manufactured etc, it might not be such a good idea now, but if it becomes as succesful as you'd like it to be, it's a must or clones and i mean CLONES of this board will appear over night..
get them stamped, engraved, a sticker, anything to validate authenticity of the board, hell even ship a a piece of paper with a number on it printed out from a $30 HP printer... something to prove ownership is an absolute must, i know this because all my torches (flashlights) are all serial engraved to prove it is what i bought i can track where in the world it was manufactured.
this way, you can ask for serial number for support, you can ask for it to prove authenticity, and only give the people who actually bought it support, i know it's a non profit blah blah blah, but this is not about profit but about protecting your intellectual property and producing boards on a mass scale, someone had to put up the capital someone had to take the risk, so please for both the people who buy your product(s) and you yourself, get some kind of serial number in place, 123456789 123 = where 456 = factory is built 789 = board number. obviously you can make it as complex or as simple as you want but serial numbers are the best way to regulate things in the long run