As for the oiler manifold and pipes..... all looked good. As for replacing the high pressure plastic one with copper... best not to since copper pipes crack due to vibration/hardening. Brake pipe of suitable dia is needed - this is a copper-nickel alloy and crack resistant or it's other metal such as steel (best platic coated to prevent corrosion though). I haven't seen 6mm dia olives when i went to get my 8mm ones but if a bike shop does them them thats a useful tip!
