I know Clarke Machine has built a few of them. They have a picture of one on their website....looks like whoever owns it bridged and extended their auger. Their snouts are really nice. What kind of combine are you considering running this on? Standard drive shieves will not last very long on more than 12 rows I can tell you that much. You may have trouble lifting it as well. A new demo 9760 with the pressure turned up wouldn't lift our 18 row 20".   www.clarkemachine.com