Small update. Finally got a chance to build the shaft for the machine. Upper and lower pole are Tesoro but middle is from a Kruzer/Racer. Had to drill through so the double pins on lower would work and reposition a single for the top.
Total weight with the shrew coil is 2.3lbs. Shrew coil is actually pretty heavy. If I can snag a coil wire with connector I may make my own concentric for it. Thinking a nice eliptical concentric would be good something similar to the lobo stock coil.