There is absolutely no need to feel embarassed. I was not trying to put your work down. What you made for your son is a fantastic present that he will thoroughly enjoy, I'm sure of that.
His friends will be asking their dad's to make them one....
And don't forget you only did it in a week. Not 6 months or a year.
And I wish you and your family a Merry Christmas and a happy Green New Year!!
Cheers,