I have not yet met a kid who dislikes building. Building is very rewarding and helps with self-esteem and a feeling of accomplishment no matter how old you are (especially trying something new like this in a supportive and productive environment).
Have the start early and give them the opportunity to start with this little workbench.
 
 
Project is  42 inches tall. Bench height is 24 inches
Photo: Fix this build that
Plan: Ana White