welcome to the site
that is one great looking bike
I got a 100$ used mtn bike to put my chengine on, when and if it ever gets shipped lol but that's another post.
you might be interested in something some other members here are working on.
you can see their mod here http://motorbicycling.com/f15/ghost0...uiser-903.html
something like that would allow you to run disc brakes front and rear