Thanks guys.
Pulled the caliper, gave it good cleaning and installed a new seal. Re-installed and I have front brakes now.
Just went for a quick ride around the block, it is back on the road!
Still have a few things to do including getting a new petcock to stop that pesky leak.
And a member here donated a rear grab rail, should have that in a few days [thanks Matt].
It's been a fun bike to work on, much easier since I'm not polishing or painting every part that comes off. Not sure if I'll keep it, but won't be giving it away.
I've been neglecting my Z1, havent been out on it in two weeks.