Thank you Wild how technical that trail is when Onx calls it a grade 3. More like a 4-5 in Colorado.
I entered the last part of the trail from the sand flats. I tried the first two entrances to Porcupine Rim and I was afraid of body damage or sliding off the shelf road. The snow was pretty hard but it started to melt when the sun came up.
Attached is a map where I entered and completed the top part.