Gary, Im Flemish.

But yes, with the right tools, HDPE is a nice material. It can be worked like wood, with the advantage of being weldable, bendable and virtualy unbreakable. Disadvantage, in some cases, is the fact it has a memory. It always will try to bend into the original shape.
This gave us nice surprises in the past. Like a wheel from TAN that went from crooked to straight after a few hours.