Printable Cork Board.

I saw MBI cork board last night and immediately thought it was a good idea. I had almost completed my purchase of them when I realised that the postage was going to be more than the item. So I left it in my cart for when I buy something else.
As an idle thought I fired up SW and tried to design one. I'm not sure that dimensions are totally accurate as I could only find the Imperial dimensions for the NEMA 17.
So, this is a work in progress. It will be updated once I have printed one and insta