Hello, I'm interested in getting started with some jewelry design... 1) What is a good size for cufflinks? 2) Is there a standard downloadable Shapeways cufflink back? 2a) If so, how do you like the standard back, is it difficult to use, secure? 3) Are double-sided cufflinks better than the ones with a standard back? Thank you! And 4) is the only way to have a picture icon instead of the happy face, with my shapeways profile, if I am using facebook or something? Thanks! EDITED TO ADD: Sorry, I thought I was creating a new topic under jewelry designers! I would delete this and repost there but I also don't see how to delete this, only an edit button.