I'm working on the twin disc, twin piston caliper set up for my F2.
The Honda spoke hub and discs is no good as the discs are too big, I think, a Suzuki GT250/380 front hub and discs would work with a little machining.
But, I don't have one I am just going on memory.
Does anyone have an old GT250, 380, 550 etc. hub kicking about and for sale??