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There is a great book, M.R. Bailey and J.P. Glithero, The Engineering and History of Rocket published by the [UK] National Railway Museum in 2000. It is an academic-level investigation with hundreds of references and exquisite drawings.
I understand the Drawings depict the Z reinforcement beam in the base, however find it conflicts with tradition in design
This might be useful: http://www.thehistoryblog.com/archives/52773Towards the bottom of the page is a fully rotatable and zoomable model of the Rocket generated from LIDAR scans.Simon.