I bent the first B-pillar roll-bar into shape and tack-welded it onto the trike after two earlier attempts to get the right compound curves that would clear the front wheels at maximum lock and when tilting as well as clear the heels of my feet when pedalling. Quite tricky.
I then managed to quite accurately mirror the second B-pillar on the other side after a bit of trial and error (yay!) and it's all looking good. Tomorrow I'll work on the rear roll bar and then the two tubes that will form the roof, windscreen A-pillars and nose.
At this rate I may manage to get most of the roll cage done before I run out of holidays. Just need to buy a new Tube-bender - I've bent the old one. I guess it doesn't like cromoly steel. Weak.