Yes, yes, yes! I love stuff like this! I'm in Cleveland but I hope to be traveling abroad soon and I'd be happy to shove him in my carry-on!
The Flat Stanley project a few years ago was a school project, for which the family member received an A. It was fun and was all done via email. I don't think I could participate via snail mail, but would love to see pictures posted here.
I'm sorry, I don't want to pry, but I was confused when you said you couldn't participate by snail mail. I'm envisioning that you live somewhere so far away from civilization that there's, like, bi-annual mail service . . . but miraculously has internet capabilities. If so, I would like to vacation there.