I just replaced all the hard & soft brake lines in my 49 3100 and I decided to try one of those premade hardline kits. Every piece fit just about perfectly and followed the originals contours just like they were OEM. All the flare fittings sealed on 1st tightening.
If I had a good flare tool I would have considered making mine up but in my case it was cheaper to go prefabbed.
Just an FYI.
Good luck
Dave