Hi, I never get envolved in any kind of swap. I belong to two guilds that each have a BOM. It has been years since I even thought doing one of them. In my experience I always end up with blocks that are not the same size. There is always at least one block that is not the right colors or sometimes even pattern. Since piecing is not my strong suit I rarely piece on purpose. To have to try and cope with someone else's mistakes is to stressing.