Re: Rim's RS2. I noticed last year that it was a popular pattern in the shops around the Frying Pan. I've used this fly for more than a few years and it does work. For an emerger, I prefer tying it with snowshoe rabbit foot for the wing, as in almost all my emerger pattern ties. (works better for me anyway). The reason is the way snowshoe can be pulled under the surface and with a little slack it rises back up, just like an emerging bug. So that's my particular variant on that fly. Not sure if it can be called the RS2 in my box or not, but I call it that.
Here is a video on how to tie the RS2.