Great work Jeff! I bet your son had a blast! I intend to go the same route. Incidentally, the little Cricket rifle that Tim got for Lucy is a great first .22 in my opinon. They're surprisingly well made, and are real rifles...just scaled way down for your favorite little shooter.
If you need more air rifles, check out
Pyramid Air. If they don't have it, you don't need it!
You may have seen this photo in the Life in the Bunker forum, but here it is again anyway. This is me with my son Robert. The M-1 Garand is his High School graduation present. I'm in the process of completely restoring it. It will have a new Wilson match barrel, new parts, fresh parkerizing, and a gorgeous Wenig Fancy-grade walnut stock. Best of all, my buddy Chris is building a pine transit case for it. It will be quite the present when it's done.
However, I digress...I think you've gotten a great starter rifle, and he's off to a flying start!