Just to be clear, each of the forgoing depictions is one of two elements of the respective spars, understanding that each whole spar has a web between the upper and lower spar caps, which is what is depicted. Both are difficult to reproduce these days. I had occasion many years back to support the rebuild design approval of another English WW2 type. I reminded myself that the aircraft manufacturers of WW2 worked with what they had, and, were making aircraft for material effective, agile, short lived fighting service, rather than longevity, nor major rebuild ease. Military aircraft, particularly wartime designs, do not have to abide by today's commercial efficiencies!