Hello Mike,
Thank you so much for the link to the Engineering Manual. It will keep me amused for many hours.
As a modern day civil engineering contractor I find these sorts of things fascinating. Recently I found out that one of my Great Grandfather Alan Railton was a Site Agent / Contracts Manager for one of the major civil engineering contractors, Topham, Jones and Railton, who built several of the major Dreadnought bases at Singapore, Gibraltar, as well as civil ports including Port Talbot and Swansea during the period around 1895 to 1904 when he died.
The most interesting large plate format photos were taken at most of those sites full of details of similar trestles, pile drivers, concrete mixers etc. I have an inclination to make a model something very similar to what you are going with a steam shovel, trains etc. Many of TJR's locomotives came from the Manchester Ship Canal and seem to be very well documented.
After my gt great grandfather died Topham Jones & Railton went on during World War I to build causeways at Scapa Flow and many of the Royal Naval Munitions factories and depots.
Regards
Nick Balmer