hey they would be more then capable of doing it, actually it would be quite interesting to see how much they would charge to do it (they are not cheap, but do beutiful work). PM me the price out of curiosity if you do head over there. I would imagion since you already have 1 that u want copied to copy it in Mild steel. from my experience with industrial fabricating mild steel is always a min of half the price in materials and 2/3 the price in labour and processing. That and if Mild steel cracks any 1 can grab a mig or arc and weld it up. Where stainless is a pain in the ass, but it serves its purposes well. Saying this if it was for a dump pipe you might find that BCA is more worth while as 1 of the blokes there has R33 that you might be able to get him to do it so he has 1.
I also doubt copying it would be cheaper then buying a complete new off the shelf part.
remember icy cold beer makes friends lol
chris