Hi. Welcome to this lovely place! I am sure you will find a lot of info and answers to your questions here. And I am looking forward to seeing your models, Dr.I for the starters.
As for your question, I suggest you post it in the appropriate section on WW1 aircraft colours, as not everyone looks into this section.
Me, I am not a Red Baron freak, I cannot answer your question right away, but if no one answers, just send me a PM and I will check it for you in the literature.