I sure like the CAD idea, I bought some brake line tubing, 3/16 and 1/4 that was not coated. I went to a few welding shops and they sell Silver solder for about $50 a roll with out flux. I think that is a little high when I could double that and buy a flux wire welder from Harbor Freight and end up with a tool when I am all done. Test solders on the brake tubing did not work out at all, I bought some Ace Hardware flux and tried some Stay Brite silver solder that I use on wire gear wrapped with copper, works great that wat, but not on the brake line tubing. I do have a flying buddy that will MIG it all for me when I have it all cut out. I do not know the wall thickness of the brake tubing but it seems strong and light. Here in Reno it is hard to find stainless tubing and thick wall aluminum tube. Only 1 place ihn town has a K&S rack and it's pretty empty. I will get some MAPP gas and some proper flux and try to solder it again, I think I saw a youtube video where the guy said to get the brake tube to a dull orange glow, propane would not quite do that.