I messed up the pics, so not great quality or quantity

These are the brackets-

The back section comes off, to allow invisible fixing, one grubscrew too lock the two section together, the other to lock the rail in position.
The rails are 10mm diameter solid stainless steel.
I bought it in 6m lengths, then rough cut it for each section of the shape.
Bar and brackets 304 stainless steel.
Final lenghs were decided after fitting the brackets.
Ends cut and polished to the same dull polish finish as the main bar and brackets.

Long rail in position.

Cut with a thin disc, then polished with a reca polymop, heat discolouration then removed with a coarse diamond block, to match the grit of the polish.
Total of 6 individual rails, about 11.5 metres.