2' aluminium stock off ebay $30. 6 -1/4 NPTx5/16 barbs from Lowes @$1.60, 2 -3/8 NPTx5/16 barbs from Fastenal @$2.03, loaned from a plumber friend taps & bits @$0, 4lbs baking soda for blasting gun from Dollar Store $2.00. $100 on beer. Easy to do. I'm gonna give myself a 8 out of 10. Next one will be perfect.