Sorry I left the invoice at work so I don’t have the exact product code. I’ll post a copy of the invoice Monday afternoon so others can source if they want.
After spending some time over the weekend playing with the two different tubes and dummy assembling the “middle assembly”, I am sold on the alloy as the better solution. It ticks all the boxes. Very light, very stiff, very tough surface finish, great to work with (cold cuts are so much cleaner) and very cheap (less than $35AUD for a 6mtr length).
Wish I had found this sooner.