I used some spacers to align the LCD panel within the picture frame and fixed it's position with some hot glue. Had to remove the spacers afterwards, as they were pressing on the LCD and causing distortions. The HMDI-LVDS converter board had some +5V pads, I used one of them to power the Chromecast with a DIY MicroUSB connector plug. It's then powered with a single 12V 3A wall plug. Used a knife to cut slots for the speakers to sink them a bit in.