WWI USMC Telescopic Rifle Model of 1917 (1903 Springfield rifle) information

[1903Collector]

A FEW QUESTIONS:

WWI USMC Telescopic Rifle Model of 1917 - I have acquired what I believe to be a WWI USMC Telescopic Rifle Model of 1917 (1903 Springfield rifle) within the correct serial number range according to Harrison. The rifle with well hidden plugged scope mount block holes in the receiver where the SN is and on the barrel with a matching SA 1917 barrel of the approximate correct month of the manufacture date of the receiver.
Winchester A5 scope - I have a Winchester A5 scope with the grasshopper spring and have purchased a newly manufactured set of color case Mann-Nieder Scope Mount blocks.

Question - can I directly solder the color case scope blocks to the parkerized barrel and receiver or do I need to remove the Manganese Phosphate from the matching surface location?

Question - Do I need to do anything to the undersides of the color case scope blocks as well?

Question - Were there variants of the Win A5 scope? The drawn images of the bottom of the scope rings (as seen on page 161 in THE COLLECTABLE '03 by J.C. Harrison look different than the WWII model of 1943 rifle with the Lyman Scope in page 166.

As the images are drawn and not photos is this just due to the artist?

Question - Same concern about the differences between the top of the handguards where the front scope ring is attached to the barrel. The image of the handguard shown of the WWI USMC Telescopic Rifle Model of 1917 does not look like the contour has been modified where as the image of the handguard shown of the WWII model of 1943 rifle with the Lyman Scope shows a custom contour.

Is the drawn handguard shown of the WWI USMC Telescopic Rifle Model of 1917 correct as it looks like it is not modified at all (with, of course, the exception of the pass thru hole for the scope block)?