Projects to make with my dad

My dad and I are spending this Sunday together and I'm wondering if y'all had any recommendations on projects/crafts to do together which take a good couple hours. He's a very crafty guy when it comes to cars and pipes and 3d printers and technology and I'm more crafty in the drawing and fiber arts type way but I'm good with just doing something he'd like. If anyone has some suggestions please let me know!