Hi Frank,
I'll try to get a trip report in the following week end. I'm sure the exposure will be something to deal with, but I've seen enough video and photos to think that it should be OK.
I've done Half Dome a couple of times, and I believe you will find that coming down is easier than going up. Take some gloves that will give you good grip on the cables (consider water ski gloves). Good luck with the climb. Let us know how it goes.
