First WWI-era SA 03...help please

[moleary]

Just acquired my first SA 03 after a few months of research and lurking here (still not nearly enough I know now!) My intent was to find a mostly correct WWI-era weapon at a good price that won't be impossible to make all-correct for my collection. See pix below, but from what I've gathered, I think I did pretty well, but could use some expert opinions on what I've got vs. what I still need:
1. Receiver SN999xxx and SA 9-18 barrel would seem to support an original pairing built in late 1918...but the parking on the receiver is realllly nice condition...sooo?
2. Checkered buttplate should be smooth.
3. Cutoff and safety are serifed and should be sans-serif.
4. Top of bolt appears to be a mis-struck SA WL3 steel lot code (which would indicate 1920's vintage bolt), but not sure...
5. The stock has a weathered look, with noticeable lightening in the handhold areas...but no apparent cartouches, except for a white "D 97" on the right butt...possible rack number or even a ship number indicating naval service? (Think I read that many post-800k SNs went to the Navy...?)

Beyond help with these questions, any help you can give me on the various other proof marks, as well as the two drilled holes in the barrel, would be most appreciated!

Many thanks,
Mike

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