Here are pictures of my creations. The first is made from 4" PVC pipe. I drilled holes in the side so the scent could escape. The fish swim right up to it and butt it with their heads. The second I made from 3" lateral line PVC pipe. It has the half inch holes pre-drilled. I normally bait this one with fermented field corn (don't get it on you, whewwee). Again they hit the pipe trying to dislodge another kernel of corn. LOL. Greedy little suckers. Both have PVC threaded plugs so they can be loaded/emptied. Then I put an eye hook through the top and tie a line onto the contraption so I can retrieve it when through. Each is between 18" to two feet in length. Normally you attract the smaller size fish with chum, say up to 8 lbs. But you can get a load of them. LOL Hope this gives you some ideas.