Apple is continuing to dominate demand for metal chassis parts from Asian supply companies, DigiTimes says. The company has reportedly booked "most" of the capacity available to build the parts for its MacBooks, which are now entirely housed in unibody aluminum. Intensifying the situation are Apple's rivals, which DigiTimes' upstream supply chain sources say are compensating for weak ultrabook sales by turning to ultrabook-like notebooks, causing both metal chassis and slim panel shortages.