My recommendation: Tell a few dealers the combo you are looking for and let them find it for you. The Chestnut with aluminum is difficult to find. Are the wood inlays a deal breaker? I can tell you that they compliment the Chestnut perfectly - see my pics for confirmation! Since you are flexible in your specs you have leverage to accept a car that gets you 'close' to your ideal Q3. I had less leverage on my wife's Q3 as she was very specific on her config. I had more leverage on mine since I was a bit flexible - I did not really want sport seats/drive select - but the rest of the car was good for me. My local dealer got my wife's car in. I drove 100 miles to get mine. Q3s are trickling in so you should be able to find what you want easily. If they straight order it would be 75-90 days according to me dealer. You are open to 3 exterior colors so you should be able to find one pretty quickly.
Good luck, John
Good luck, John