i was thinking silver brazing without lugs since i was planing on using non standard / bike tubes, for the head tube 48mm outer and 34mm inner diameter should fit 1,1/8 headset and for the down tube maybe something bigger to support the weight.
my problem with welding is that im probably going to burn holes in the frame and brazing seem easier to get right and looks better as well.
in terms of wight performance and considering that it is my first time, is it worth to try the cheap flux core welder or should go with thick brazing?