prusa mendel dual nozzle setup

am exploring a dual nozzle setup on the prusa mendel i2, the hotend mount was design with the V6 clone in mind. the carriage is a modified http://www.thingiverse.com/thing:18657 just I have dabbed a little hot glue to hold the bearing in place rather than using bolts

initial test are encouraging the nozzle height looks close just waiting on some cabling to extend the 2 nd extruder stepper. https://www.youtube.com/watch?v=Zul7IGLDeX4