Thanks for the pointers. I will try and touch base with him.
Meanwhile I made a prototype Pipe bender i used a 68 mm hole saw to copy the internal radius of the bend and scewd the blank to a piece of plywood.
I used 10mm bolt for the pivot point of the handle. I got some skate board bearing races of amazon for the former. I got mixed results the test bend was perfect the full sized pipe ended up a little flat.