I'd like to offer a little input. I kinda question the incident of the brake line on the Zink. Perhaps he was running 3 instead of 4 for the inside diameter? Too small an id would duplicate his concern.
I have run steel braided line on just about everything that I get a chance to modify for better than the last 25 years.
I had a couple of very good chat sessions with Carroll Smith many years ago when he was managing another MacPherson's racer.
One of the subjects we went over was stainless steel braided line, and his preference on Earl's Supply as a source for components. Carroll was very adamant about building his own brake lines, as he had control over the quality, and he was also very adamant about never using bare rubber manufactured lines on a car used on a course to be driven in a competitive mode. He stated they were great for classic cruisers but not for a competition car.
Later he went on to establish a braking concern with another guy(forget their name right now), so again, I have to accept his intelligence, opinions and capabilities.. I rely on his advice.
If you have any concern with quality of the hose you're buying(fully assembled) Most municipalities or airports have reference to a local plumbing supply store where you can get the stainless made up to your specs, hose, diameter, fittings, etc. for not a lot of money and should give you good peace of mind.