Translate 320-Page Storybook to Spanish

I have a 320-page English storybook that I need rendered into polished, formal Spanish for an adult audience. Cultural references and idiomatic turns of phrase should stay exactly as they appear in the original; no localisation is necessary beyond faithful grammatical adaptation... (Budget: $250 - $750 USD, Jobs: Content Writing, Creative Writing, Editing, English (US) Translator, Language Tutoring, Proofreading, Spanish Translator, Translation)