Can one of you current iMac owners help me with some measurements please. I am ordering a custom size piece of hardwood for a study "nook" and need to decide on depth. The width is 700mm which is the length of the wall. Can someone please measure the depth required to comfortably fit a 27-inch iMac with keyboard/mouse and enough room to rest arms while typing. Rough drawing: Any other ideas from people who have made a computer desk welcome..