RE: 3.5yr old building 1st kit!!!!!
Having a daughter that has an interest WITH me, not being pushed into it... You will still be accused of pushing him into it whether he is the one initiating it or not.
Just be prepared. My daughter is 9 yrs old, and I get grief even at her age. You will never convince those that disagree. Been there, done that. I think you will enjoy this very much. Starting a 3.5yrs old, he ought to be a prodigy!
Take lots of pictures and share with all of us, please!
Brian