I'm pretty sure this is all I needed:
2x - White Plate 1 x 3
http://www.bricklink.com/catalogItem.asp?P=3623
2 or 4x - White Tile, Modified 1 x 2 Grille with Bottom Groove / Lip (could use 1x2 plate)
http://www.bricklink.com/catalogItem.asp?P=2412b
2x - 1x8 White Brick (could use Dark bley or another color)
http://www.bricklink.com/catalogItem.asp?P=3008
2x - Dark Bluish Gray Brick, Arch 1 x 4 (used 2x 2x4 brick instead)
http://www.bricklink.com/catalogItem.asp?P=3659