I am left with a question.
Why not use the original edition, which is probably very close to the MS, as your primary source? The Muzgiz is a secondary source of dubious merit, and it is so badly engraved. The original edition is superior in every way, from overall layout and density, page turns (none needed), positioning of dynamics and hairpins etc. to what you are coming up with.
I will use measure one as an example.
First edition:

- Rachmaninoff Prelude.jpeg (42.33 KiB) Viewed 13156 times
The original hairpins indicate a SMALL swell toward the beginning of the third beat. Including them within the slurs to place them very close to the lowest RH voice shows that the swell is mainly for this voice. The P marking is placed above the staff to show the two completely different tonal planes in each hand.
Muzgiz:

- Rachmaninoff Prelude 2.jpeg (43.89 KiB) Viewed 13156 times
Most of this is destroyed in Muzgiz. Where is the peak of the swell? On the AND of the 2nd beat? OMG!!! And it now appears that the swell is for the entire chord, which cannot be given the thinning of the the texture from 4 notes to 3. The P is repositioned in an attempt to point out the middle voice. More information is lost.
As an exercise leading up to op. 30, I would first try to understand exactly why R. wrote what he wrote by studying the first edition. Then imitate the original edition exactly as it stands. I would only make changes that were real improvements, i.e. where spacing might be improved a little here and there etc.
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