I did a loop of RPP in May of 2013. It wasn't as heavy a snow year, but you may find some helpful information in responses to questions posed prior to my trip, and in my trip report found
here.I don't recall if it was in the linked thread, but I did receive a piece of advice that, although you may already know, is good to remember. Where rocks are exposed in the snow, the heat from the sun warms them, melting the snow immediately around them, sometimes leaving a snow bridge around its perimeter. Be careful when navigating these, as even though I was conscious of it, I still find myself mid belly into the snow. I was lucky not to have gotten injured.
Be safe, have fun.