Actually, it doesn't have to be 6061 or 7075. Those are two most common alloys you'll find in R/C and I assumed it'd be one of those. I can do other Al as well. Some cheap Al and die cast Al has too much smut and will not anodize. Basically, If it's machined, it will anodize well. But different alloys anodize at different rates so if I mixed them one could get over cooked or vice versa. I can run mixed parts for you but you won't have consistent results between them and I feel better knowing what I am dealing with to get professional results....
I am trying myself to decide what my color scheme will be on my next conversion. going to be unique for sure, yet look factory!