I did this one for personal use, thought it might be useful for you as well. New MacBook Free Mockup. The main deference that this has right “apple” corner radius. It took some research to nail it right. As an extra you get black edition for your slick design needs.
It’s totally scalable but I still recommend to rasterise after pasting your design in it and before resizing, some pixels might get off while resizing. Never resize unflattened image!
Created by Nick H
Coloured with two styles
PSD Files. Enjoy 🙂