Think i'll give it a try with the yerf master C, thanks for the info. It's going to be a tight fit, but i'll probably put the master behind or beside the brake pedal for a straight solid push on the rod. Trying to simplify/de-linkage as many things as possible. There's a "T" type block on the Sunl master that i may scavange to feed both circuits, but i'm also liking that setup you have--i take it the handle is a parking brake? Curious as to where you got that, would be nice to dump any thoughts of using the cable brake setup on the calipers.
Got my front jackshaft mounts in, need to clean up the welds on the one close to the upright. Haven't made up my mind between plate or tube gussets for upper support.
Did some shade-tree keyways. angle grinder and dremel ... Of course i had the sprocket and bearing directions all figured out before i took it apart to make the keyways and didn't take any notes
Just hung in place right without final alignment tweaking.