Indonesian-English Letter Translation

I have a personal letter that needs to move smoothly between Indonesian and English while keeping a formal tone throughout. Accuracy matters to me just as much as sounding natural, so every sentence should read as though it was written originally in the target language, with spelling, punctuation, and formatting faithfully preserved.

What I will supply: the source letter in either Indonesian or English (or both, if a back-translation is required).
What I expect back: a polished version in the other language that mirrors the layout and intent of the original, ready for immediate use.

Please work directly in Word or Google Docs so tracked changes and comments remain intact. A brief note explaining any unavoidable nuance shifts will be appreciated. Turnaround time is negotiable, but once we agree on a deadline I need it honored.

If you have solid experience translating formal correspondence and can demonstrate a meticulous eye for grammar and flow, I look forward to collaborating.