Simon, you are a superstar!!
I was kinda stopped at that point wondering whether to go with some framework, rigging and flooring when you made your kind offer and solved my dilemma completely. Looks like I could do with an antenna-type drum, but otherwise mostly reasonably likely for a real 1916 machine.
I don't use hosting s/w so can't link but can post Simon's pictures as attachments if the other recipients don't host either.
Once again Simon, my appreciation and gratitude.
Sandy