I have the 4" tube and sure like what can be done with it. That layering Lamar is a slick idea....I haven't tried that yet.
Most of my tubes are built for Lake Trout but I have cooked up a few for a couple buddies who fish walleyes using them as a dead-stick type of bait....just drop the tube/jig down to the bottom, take up a couple feet of line and set the rod in a holder and wait for the hit. The do amazingly well on rods set up like that.