Started my headers on the weekend,
Played around with the tube modelling kit till it all fitted.
bought some bends with 2", 3" and 4" Centre line radius to match the model.
The pipe models can separate at each change in plane, which you just sit on the pipe, mark it up, then cut.
Tacked in place
Next job is too pull the pipe assemblies out, TIG weld around, clean up the welds and refit for tacking to the flanges.