Your British engineer probably drives the trains. Kurt Tank worked with Rohrbach building flying boats but was convinced that land planes were the way to go, and left with his ambition. This ambition became the Condor which flew from Berlin to Brooklyn in 1938, over 4,000 miles against strong headwinds, and returned. The fuselage was wider than a bomber needed, and construction was lighter. Its conversion to military required the addition of a long gondola under the fuselage to house defensive guns, a bombardier, and a weapons load. Hitler selected one as his personal transport. Germany needed 1500 B-17s and some Mustangs, not 267 Condors, to make any difference in the BoB, and Dowding would still have something to say about it.