I ended up having it made.  Ryan runs a workshop from home (just out of Waiuku on the Awhitu Penninsula) part time specialising in stainless exhaust fabrication and has a strong sideline in resoring and building 4WD projects from what I could see. Super-friendly, quick, and reasonable but not cheap - $220 all up. Exhaust is in 316 and is an exact copy of the fabricated item it replaces.  Ryan machined the grip rings on the barb for the water inlet - nice attention to detail. He is
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