I did mine a bit differently. I added the muscat grape juice at flameout. I was concerned about the sterility since it was given to me by the owner of my LHBS in a glass bottle, so that is part of the reason for adding it in the boil but also because I was following the Brew Your Own recipe. I also added the saffron in the last 15 mins of the boil & added the honey at flameout. It tastes great so far but I'm letting it age in the keg for a while, maybe a month or so. I don't have the ability to cold crash so I had to just be patient & let the yeast drop out of suspension naturally.
After doing some more research, I will do it differently next time, much more similar to this technique. I read the article someone posted a link for on this thread where one of the Dogfish brewers said they add saffron in the fermentor for aroma more than flavor. I'm wondering how I'm going to do that..whether to boil it in a little water or just soak it in 95% ethanol for a few days to sanitize it. Also, I just listened to an old podcast interview of Sam Calagione on The Brewing Network where he says they add the honey during the whirlpool above 180 degrees. Since I'm not able to do a whirlpool since I use an immersion chiller, I think I will cook it in a pot on the stove for 45-60 mins around 180 since that's how long professional breweries typically whirlpool. Sam also says they add the muscat grape juice a couple of days into the fermentation. So next time I'll also get one of the sterile cans of muscat grape juice to do that.