Pre-fabricated or pre-made corners are recommend for all first time installers, sub-contractors and do-it-yourselfers. Unlike pre-fabricated corners that you may be accustomed to, Elite Trimworks custom manufactures there corners to OVERLAP, not but-up to your cornice.
Over-lapping offers many advantages:
-1/4" of tolerance when cutting trim
-if and when the trim shrinks, the overlap will hide the gap
-many people find it to be a more refined look as a bonus

Call if require additional details