The problem with using a hollow core door is that the inside is only framed around the perimeter. After cutting the desk top 50" long, one end is hollow so I cut a piece off the top to insert into the end.
Next, I cut some braces with my full size saw. Her little fingers were tired and the little saw was charging.
Next she drilled pilot holes for the screws to go into. Pilot holes are very helpful with alignment and keep the wood from splitting.
Here she is putting the last few screws in. I told her to push hard and she did. I only had to give three of them an extra twist with the drill to get them down a little more.
Here we are both in the picture showing off the various tools used, she is checking to make sure the desk is level and I am acting like I am measuring something.