What metal to use ?

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Now that puts the cat amongst the pigeons , not sure about the blue tint , the added weight of stainless had occurred to me so thought about getting the bulk milled out to lighten them , the front and rear bumpers I think might be best from stainless for strength but if I am going to replace them all its probably best to make them all from same material , to be honest my experience my knowledge of metal is very limited so not sure what will give the best finish allowing for filing and working. I havent done detailed metal work since high school some 24 years ago ! !