Hi Jon and Logan! I live not too far away from you, in Portola Valley.
While there is not a junior forum, I'd suggest that Logan pick a model he likes and start a new post of his own. He can introduce himself along the lines of "Hi my name is Logan and I just bought a model of the Monogram M 48 Patton kit."
Post that in "Armor" and you'll get all kinds of attention.
In particular because of your sons age, I'd keep any further discussion of personal stuff pretty general. Have him pick a screen name like "Kap fan" or whatever tickles him.A big no go is to ever let your email out online. But other than that you'll find this group to be encouraging and positive.
Our editor Tim Kidwell has a son "Dark Force" who's probably about 7 or 8.