Have you determined the final pricing for the tubes?
Not yet... It will be around the ball park figure for Ti 18650 $50 plus shipping. I need to work out the price for Ti 18500 which I think $30 is fair price and once I cost up the aluminium and it actually happens I can report it on the sales thread. The aluminium will be cheaper but not that much less as the bulk of the cost is labour and the initial tooling costs.