Exterior edge trim sources

I am deciding whether to just round the edge of where the roof meets the side wall or put a metal edging there. I am good with the straight pieces, but have a gradual arc section very similar to the hiker trailers design. Can any one give me a source for black aluminum edge that would make that sweeping arc? I am afraid the standard "1" or 3/4" leg pieces would buckle if I tried to bend them.
The finish is plywood, treated with "the mix" and then will have two coats of Durabak-18 Truck bed liner. I could just do a roundover on the edge and treat it similarly, but I like the idea of a metal edge there. Not really worried about the water proofing aspect as I believe the mix+tb liner will be good there, more for asthetics and edge protection.
Anyone have sources or similar situation?
The finish is plywood, treated with "the mix" and then will have two coats of Durabak-18 Truck bed liner. I could just do a roundover on the edge and treat it similarly, but I like the idea of a metal edge there. Not really worried about the water proofing aspect as I believe the mix+tb liner will be good there, more for asthetics and edge protection.
Anyone have sources or similar situation?