Qucik clarification regaring print resolution:
A guideline is 2657 pixels wide and/or 3636 high, 300 DPI (portrait), or 3636 pixels wide and/or 2657 pixels high, 300 DPI (landscape). Your image aspect ratio and layout will dictate the final resolution. These are given as guidelines. To be safe, render images that are larger than these specified.
In essense, we are to render out (if using a 3d program) at 11072x15152 @ 72ppi. Then resize image in PS to 2657x3636 @ 300ppi.
Do you want final image to be converted to CMYK or remain as RGB?