The Look of Zinc

Hi I extremely interested in doing a standing seam Zinc roof in the Portland Oregon area but I am having great difficulty finding anyone that has any interest in doing it. And evrybody puts down the whole idea, I think because they just want to sell what they have. We have stretched our existing comp roof to 28 years by taking great care to keep it clean of needles and moss but it is about done. I have a 5000 square foot plain hip roof, 6.5/12 pitch roof in a mountainous area, and my house is surrounded by doug firs. So, we get lots of needles, and moss and algae eventually latches on to everything around here. The front plane and the ends of the roof are all very visible from the road. We took great care when we built here in 1991 to have no penetrations on the front and ends just because our roof is a good part of the look of the house as it is so large. I fully understand that Zinc is expensive but I'm getting tired of people telling me it isn't suitable for my roof. I've always thought Zinc would be great for this environment. Am I missing something? I would prefer to be conservative, perhaps a 14" seam to seam panel 1 3/4" rib made of .8 mm (.031) Rheinzinc. I like the idea of snaplock because it seems OK for my pitch and it seems like it would nicely allow for movement, and I like the idea of being able to easily remove a pan for repair if needed. Yes I can afford it. Am I really that far wrong to consider Zinc ?