This is such a touching post man.
There are not many people in this world who could do what you do with your son. Your love and dedication to giving him the best life possible shines through your photographs and thoughts, and is very apparent.
His joy is apparent as well during these moments. That three wheeler is super cool and it looked like he had a blast on that raft too!
I love how you think in ways to help people with this condition in the future as well, like with the exoskeleton idea. This is feasible with AI I think.