Better yet, get David Chicoine's "Sixguns of the Old West, Smith & Wesson", it includes the Model 3's of all vintages, the Russian and Schofield, the clones and part drawings.
Incidently, the Russian is not a Schofield and a Schofield is not a Russian. They are two different revolvers, and the original S&W guns had very few interchangable parts. The Italian Uberti Russian and Schofield have more interchangable parts than the originals, as neither is fully authentic, but all those parts would be inside.
If you need any specific dimensions of either (Uberti), email or PM me, I'll see what I can give you.