Re brake lines: I put Russell SS brake lines on my Suzuki in 1980 and they still look and work fine. Galfer will also make custom lines, like for those Honda's with linked brakes.
Re HH pads: Terrific brake pads for the street. I put DP (Dunlopads) HH pads on the front of my Honda. Much better than stock. EBC and SBS also make HH pads.
Re sintered pads: Metal pieces, usually copper, are disseminated in the mixture during manufacturing, and heated to form the brake pad.