I have already cut the back out of spare plywood from my shed. Also I have done two smaller pieces as we are taking them to a birthday party in about a week's time.
I am taking another Win a Chocolate bar allwin door that fits well on same hidges etc that dispenses Nestle's animal chocolate bars. So rather than worry about fitting locks I am putting a simple hook and latch that can be operated through a middle space at the back. I am also taking an Autofruit an electro-mechanical machine to give a little variety!