You've got skillz with a TIG! The welds look fantastic and the layout looks like a very workable plan! I noticed you mentioned the turbo is hanging from the pipe. I don't distrust your welds or material selection (you know your stuff there) but I have to wonder about the 2-bolt flange at the manifold.... I can see the potential of vibration/harmonics stressing that flange to the limit. The intake side of the turbo will be dampened somewhat by the tube to the intercooler but it won't be a load bearing joint... Right? Is there any way of adding a brace from the intake side of the turbo back to the front of the head? It could relieve much of the stress on the pipe and 2-bolt flange while dampening any harmonics of this mass hanging forward of the manifold. It would be a safety catch too. Maybe I'm worried about absolutely nothing... But I would feel safer about having something helping to support the weight besides the manifold.