...well that's the thing: I bristle at this idea that anyone can just "do a Williams" thing. That's ridiculous; everyone I've heard who set out to do that failed, usually because while they might understand the orchestrational approach, that doesn't magically imbue them with the symphonic sensibilities. They sound like people doing JW who don't actually understand what he's doing. Bad impressions.
Having just written 84 mintues of score in 5 weeks, I can attest to having zero time to second-guess or attempt to do anything compositionally other than get the cues done, and right now. If someone says to you, "Do what you do, right now, and don't think about it because there is no time," and it's internally cohesive and competent, then it's a pretty safe bet what's coming out is you. It's your first instinct, your comfort zone, that which you've internalized, that which you understand, can control, and have mastered. Nothing's worse than deliberately trying to do something you wouldn't actually do, to sound like somebody else (or not sound like somebody). Personal style is always in there, and over time, takes many forks and roads; you don't have to force it and you don't have to sweat it.
As I look down at the pile of reference scores I cracked open from time to time on this score, which are still on the floor, I notice the usual suspects: Ravel, Schumann, Barber, Holst, Penderecki, and no Williams. But that's where "Williams" lies, in all ways, anyways. It's an amalgum.
_Mike