Yes a few errors there in the video. The talk about isolation of piers is odd because I don't think they understand that if you isolate the pier from the surrounding concrete or flooring then there is no vibration passed through.
For pier construction I decided on a similar design to theirs, although I just thought it looked right and knew the girts would add to rigidity. I had no idea that other firms were producing piers that looked similar, which is a happy coincidence.
My pier is 8" in diameter (ID) with 13mm thick walls and stands 1.3m. I got it fabricated by a metal fabrication firm locally and am sure you will find someone in Sydney who does this sort of work. I had to do a few simple drawings and tell them the thickness I wanted for bottom plate and pipe wall. It cost around $700 but it is very well fabricated. My first pier I had to explain what I wanted the pier for and why it had to be so rigid. These guys were intrigued but produced a good pier on both occassion.
I think you would be in your best interests to go to the work shop with your drawings and show them what you are thinking and talk with them for a bit (without boring them with the details). I found this worked really well and gave them an understanding of what I wanted to achieve.
There does not seem to be anyone in Australia that specifically makes piers, but there are plenty of good engineering firms that make all sorts of steel products.
A 1m cube of hardened concrete is about 2.4 metric tons. They repeat this error a few times in the video actually 
