Im adding a bath vanity in an existing corner, I plan to build a 4 ft high wall on the other side out 36 " from wall , should I leave enough clearence to clear the vanity top (31") and fill in the 1/2 " on each side of vanity with wood strip or should I leave only room for vanity 30" and saw off the vanity top . Im worried about matching the finish if I go with a stained vanity.