I never said that John had served on the S Boats and neither had David Hill, what I did mention is that they are maritime draughtsmen and that there are those whom do study the subject. I have picked up the point that a serving officer can request to have changes made to the boat, well yes that was true when the boat was on the build fitting out. These changes were usually made by the new commander and engineering chief which would be working with the constructor prior to any members of crew and of any rank arriving. However, the colour schemes which were decided by the Admiralty were standard and were not open to negotiation. The pattern of camouflage pattern may differ obviously but this would due to dockyard mateys or spare crew on depot ships and bases carring out the work.
However, in the attempt to answer a question to aid a modeller earlier, it appears a dispute has erupted. All I can say further now is Read, Read more books from those who do know.
But obviously you know more