It's a beautiful thing to spend time with your love ones and in this case your nephew, I can see that he is a smart and creative kid and is very quick to learn and evolve
Allowing him to build the truck on his own with little assistance will help him to develop critical thinking and allowing him to brainstorm which in the future will be a huge benefit and advantage for him
It's really lovely seeing this and thank you for sharing this @galenkp
Yeah, I agree, he's smart and will only get smarter.