Fabricated Rear spar bulkhead support angles from raw stock. Ended up with slightly shord edge distance in the two lower fasteners after installation. If I had to do it again I would trim the angle wider at the lower end. Slotted the side ribs for the seat belts. Marked the rib slots using the template, drilled the ends of the slot with a single #11 hole on in the drill press, opened up the hole to the full slot width with a rat-tail file, then conected the ends with a cutting dist in a dremel tool. Chamfered the center spar attach lugs.about .05 X .25. Fabricated the rudder cable guides from raw stock.