A photo for most of my days....
What a great project to work on together, a very memorable one too. They both have the patience for details and precision..
What an incredible project for father and son! and you've documented it so well with your photography!
Holy moly! This is quite the project! And what a bonding experience for the to of them also :)
What a wonderful project!! Your son is blessed to have his Dad in his life to experience quality father-son time like this!