I tried to ferment an orange juice/pineapple juice cider thing a while back... It did not go well. After almost a year (I saved some after my initial attempted taste bud murder, you know, for science..) there was still a wicked orange juice flavor to it. And not in the good family way either.
That being said, I fully support your adventure, just use caution. I don't remember the exact amount i added, but it wasn't a whole lot. If you have the capabilities you could do a few test batches, or (what I would do) pull off some fermented beer sans OJ and add the oj a bit at a time until you get the flavor you want. The color might not be perfect though. After you have a ratio of beer to juice you can scale it up to the whole batch and everything *should* be all right.
If you are looking for a nice red color, there are plenty of red malts that could help you out so you don't have to go through this trial and error. You could add some honey malt for residual sweetness, and then the blood orange peel for the citrusy feel along with the citrus hops (cascade and the like...).
I hope your beer comes out better than my cider... I still can't bring myself to drink the other bottles... 2.5 years later!