No No No !!! That's no good for you and your lil guy !!! Just leave that for me... I'll look after those trucks for ya..
I'd did the same with my little guy too... We drove around our local country roads knocking on doors asking the farmers if they wanted to get rid of that old truck in the field.
At the end of the summer we had 6 Junky old chev trucks in the barn.
That winter me and me 12 yr old son built and 89 chev truck the scrap parts and some store bought parts and sold it that spring for $1200
My son worked on building himself a bastardize 76 with no box. (with some help from Dad) His reward was, he got to drive it out in the back field. He was close to 14 yrs old buy the time it started

GOOD TIMES... he's 27 now and still smiles when he talks about it. He grew up to be a licensed welder then a recent Currier change, now he's doing his apprenticeship for auto mechanics.
Doesn't matter the vehicle your working on with him. It's the time your spending together.
Oh ya.. My son told me something just recently, that he learned back then during his time in the shop with me.
He learned patients.
I remember he use to get upset when something wouldn't fit. He would get mad, and I would tell him to "take a walk, calm down, then come back and try it again".
He still practices that today and teaches it to his kids.
Enjoy your time.