Antique British colonial engineering drawings from 1926, with photos! Please tell me the value!

My reading of the map: The map shows the planned WELLINGTON Road going north to south and HONGKONG Hong Kong Road heading northeast. There are two ditches and a small bridge on the original ground. The name of the picture: WELLINGTON Sewerage Plan of the British Municipal Council, scale: 1 inch = 20 feet

My opinion: This is an out-and-out fake cultural relic - if it can be regarded as a cultural relic!

1. The flow direction of the natural ditch is incorrect; 2. The features of the small bridge are not standardized and should be drawn with standard straight lines instead of hand-drawn straight lines; 3. The east side of the southern end of the ditch lacks the top line of the slope. ; 4. The ditch slope line is drawn upside down, which means it is an embankment. Moreover, there is a wrong drawing method. The correct drawing annotation is a standard straight line with equal intervals between long and short lines. In this picture, there is a situation where two short lines are drawn by hand (that is, when we just started studying surveying and mapping, the teacher often made the mistake when asking for hand drawing. Error!); 5. The drawing scale should not be marked with units (feet, inches) for large-scale projects like this; 6. It is obvious that the original landform drawing only has ditches and bridges, but no approach bridges. It's too unprofessional to pretend, and living on the water and setting up a city along a road (bridge) is often the initial stage of urban development in ancient and modern times, both at home and abroad. Are there no other civil buildings near such a large bridge? Why are two major roads and municipal sewer pipes planned in such a place with no residential buildings? ; 7. The signature is not a standard Western notation, but a typical Chinese notation; 8. False explanation about the preservation of the drawing: This picture is first folded in half up and down, and then folded twice! The yellowest part should be in the middle, the color contrast is incorrect! ; 9. The fonts are marked with isoline, like CAD fonts; 10. The West is the basic founder of modern science of engineering technology, and its drawing rules are quite strict, not this kind of crap.

If you are not far away, you can go and take a look at the construction drawings of Dr. Sun Yat-sen Memorial Hall preserved in the Nanjing Sun Yat-sen Memorial Hall. They are also hand-drawn and very beautiful!

For your reference, if there is any inappropriateness, please communicate with each other!