Eagles,
Sometimes in our shop, when we have to make a relatively long or complex run with an expensive (as in you don't care to do it twice) material like exhaust pipe, or a critical piece of fuel line, we'll make a model first. Welding wire of a fairly stout gauge is a good medium. If there is a particularly long straight section, you don't need to include it. Just do one end, leaving plenty of whatever material you're bending for the other end. Alignment for the other end now becomes easy as you have the first end to show orientation.
Also, I'd caution against the temptation to run straight lenghts of pipe behind components which should be removed and the bending the tubing in place. You'll save a little time but you might not be happy with the result. It's pretty hard to get the cupro-nickle line to lie straight and wiggle free on the bench, let alone under the car with one end screwed into a fitting, and the bulk of it tangled up in other lines and clamps.Remove stuff, take your time, and work deliberately. You are, after all,, working on your brakes..
Motorbill
From Lola to Land Rover, If it's British and has wheels, it's likely I've bloodied me knuckles thereupon