A healthy dose of reality is always welcome, cheers!

The bar in the picture is literally just a construction line, we were intending 1250 x 125 x 25 for the bar, with bolt on impactors to take it to 1300mm.

Tubular steel - I've used and cut and welded it before, but never to an actual design. Back to the drawing board! I'll scrap the HDPE idea.