Prepared all the aft bulkheads and fabricated their associated parts. Deburred, dimpled and countersunk as per drawings. Tried a 100mm grinder with an aliminium cutting disc in it. Worked well. My bandsaw blade has had it, will need to get a new one. Alumipreped and alodined all the parts from the aft bulkheads and hung out to dry. Will need to paint inside as frequent showers coming through all week.