Since you like to talk so much about bike tubeing, in another thread I suggested that you take 3 or 4 steel frame bikes of various price ranges and cut them apart. This is another place where that advice would be appropriate. There is a world of difference in the tubeing wall thicknesses of bikes in the various price points. Basically, the more expensive the frame the harder it's going to be to weld. I'm not sure if a nivecrom frame can even be welded.