He's also learning spatial relationship and the ability to look at something and then turn it over in his head a trait that is sadly lacking in 99+% of younger people today as I saw first hand teaching CFRP to Boeing new hires who'd never worked on anything other than how to twitch their thumbs and had no ability to figure out how things fit together.
He and you are both doing a bang up job and you're passing on legacy and knowledge to him the assembly looks great and it really is an advantage starting with a challenge, it's like riding a motorcycle always ride one that's got enough left to spook you a bit so you don't get complacent.
NICE JOB TO BOTH!!!!