He has 15 parts missing and that is not fun for him. Let kids have fun finding the missing bone parts and adding them in. They can keep glancing up to the small picture at the top right (this will help with oculomotor skills) to see if they have all the bones completed.
PT: Have fun copying many skeletons off, cutting them out and laminating them and make a walking or hopping path with them. Kids love standing on skeletons.
We have also added Skeleton Trace Me which can assist with upper body strengthening, balance, and visual-motor skills.