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Can't comment. There are so many ways to build up something like this into a major work. You really need to sort out the themes you'd like to use and see if they can be developed. They're certainly expansive enough. Did you start it in short-score? It may help to get the overall structure sorted out. (This is where pencil and paper are handy - you can write the piece and note what instruments you intend, without having to work in full score. You may have to pull out the main themes to look at them anyway, depending how you work.)
If it's going to be a one-movement work, you need to develop the material to produce a climax. There's a recent posting in the "Orchestral Forum" Symphonische Kantate which is exemplary so far as climx goes. Have a critical listen to how it's scored as well as the structure and timing.
But then, if you intend it as a movie track you may get away without a climax.
M
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