The USoE violin 1s sound nice but are possibly a bit too thin for this kind of sound. And as someone already wrote; it would have a lot to do with mixing (choice of mic positions, possibly reverb etc).
If you want exactly that sound with one library, I'd start with trying out the most flexible ones. Spitfire Symphonic Strings sound quite large, and you can also layer normal legatos with con sordinos (a well known trick)... SSS actually has a special combo articulation with these two recorded together also. Plus, for the bigness and lushness, SSS also has it's Rachmaninioff artic (would be too intense with maximum dynamics, but could serve as a layer moderately used).
Both SSS and SCS have many long note articulations that can be combined into epic sounding results, if you adjust the levels between them a little. It could easily end up sounding larger and less detailed that you'd want it to.
Even SCS alone (normale, con sord, flautando and sul tasto combined) can sound quite large, even if there are only 4 V1s in each section. Berlin Strings (normale and sul tastos combined, if you want) and the 'lush' presets in Afflatus could also be very useful. Afflatus also come with various section sizes that can be used together, but Afflatus doesn't have dedicated vibrato control - vibrato follows dynamics. Some of these libraries sound 'too soaring' at full vib levels, but that's not a problem with Afflatus.
In that case: why not start out with combining violin 1s with violin 2s, and/or add the queen of the string instruments; the violas on top of the violins... and so on. If you use the trick with combining articulations that I mentioned for SCS with layering V1s V2s, you would get 28 players, and with violas on top you would get even more.
Lots of possibilities if you have any of the flexible libraries already. Just remember that with too many layers, it can sound layer-y, and also that all these details which make string instruments sound like string instruments (and not like expensive synth) sometimes disappear if there are too many of them.
And btw, it would probably be easier to achieve a believable version of the lush, large sound in the end than an as believable version of the more intimate sounding strings earlier in the piece, so make sure you have something which handles the most difficult part well.