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1) Yes, I'm ready to participate, although my skill level isn't very high.
2) I can come at any time.
3) It takes 2 hours to get to Moscow, but I would prefer Michurinsk or St. Petersburg.
4) SoD, TE-light, I'm ready to try TE-full, but I think I prefer SoD.
If I remember correctly, Russian Railways offers bookings 45 days in advance, for any train, any seats in a compartment.