Farted around trying to try the bulkheads, due low overhead in the shed. Seatback impossible. Did some trimming on the others. When temporary firewall and F22 fitted sides seem a fraction long, but hard to tell with everything wobbling everywhere. Need a new plan.
Became alarmed that F28 doubler is too far aft. Then discover the doubler being fitted is confusing me. Even so I think the doubler should protrude, yet it is a fraction short.
Redesigned seat brace. Will have no fuel valve, and intend electric landing brake so redesigned for a larger pocket. [Timewarp 27/05/14: Didn't really understand that there needs to be a void underneath for the throttle cables, so had to redesign while assembling, pocket is still bigger than plans.]