Well done! You obviously have heard Rachmaninoff's own recording of this, right? I noticed the ending, you played it just like he did: adding 2 more final G's, the last one being loud =)
I enjoyed your attention to the inner melodies in the middle section, good job. Sometimes, however, a few times I didn't hear the whole melody in that inner voice. In bar 42, your LH brings out that inner voice wonderfully, starting with D E F# G . . . but it keeps going in bar 43: F#, G(RH) A(RH finger 2), and then back to LH A, Bb, RH C (bar 44). And then almost the whole thing again starting with second half of bar 44: D E F# G, F# G A. You did so well at letting us hear the others that I know you can do these too

One other important detail, check your LH notes in bars 33 and 34. I know you're aware of other wrong notes that are a result of difficult chords and jumps, etc., but these I think you are unaware of. Be sure the bass is
A-D,
A-D, not
F# D,
F# D.
Also, what piano did you use to record this and how did you record it? (kind of microphone, placement of mic, recorded to minidisc, tape?)? I'm having trouble getting good sound quality and yours is very good.
Thanks for sharing, I enjoyed listening!