Thanks for the link Tino. I had a bit of a look around but apart from the animation on the services page I couldn't find any examples of their piers.
That's about what I'm after Fahim, thought I'd be more inclined to go with a plate fixed directly to the concrete pier, rather than have adjustment nuts under the plate. Shouldn't be too hard to make.....by someone who knows what they are doing.

I actually have a pipe already, 8" stainless, kindly donated by Astroron, but I only need 6" so it might have to go to the outside, to be constructed, guests pad.