Russell (Edelbrock) make DOT lines from the frame to caliper. When I originally set up my current project car brake system, I used "for race only" lines but since then have changed to DOT - if for no other reason, NY State wants to see that tag on them. The rest of my lines are all stainless hard lines with AN fittings. I would not choose to make up high pressure lines out of flex material as I really have no way to effectively swage the fittings to satisfy myself. AN fittings will hold the hydraulic pressure but I am more concerned with pull out from the fitting as happened to me when the local Aero-Quip dealer made one up for me in an "emergency" when I didn't have time to wait for a mail order replacement. (Syracuse NSRA Nationals, 1995) Juice jar single reservoir master cylinder, no brakes = an exciting drive (major brake mods after that trip)

I was able to sell my unused non DOT lines at a swap meet for about what they cost me.