I did a company like that for my brake lines. Might have even been classic tube. I did stainless. They fit great. My fuel lines are all plastic accept for the line that runs around the cross member under the engine.
I would maybe try to find plastic replacement lines if it was me. Or go with premade steel. My brake line kit was only like $220 bucks all premade. I did also buy a chunk of stainless line with flares and nuts on it as I had a crewcab and their kit was for a regular cab truck.