I design and build many media units for my clients. I really enjoy designing and making them. It is always about maximising the space available and normally they are split into 3 sections, left middle and right. The middle section is normally wider than the left and right section, but this will always depend on space and proportions. Lighting is always a nice edition and I use LED lights which are hidden nicely but create a warm glow to the open section. I think the classic media unit has shaker doors below, a oak worktop and open section above with either fixed or adjustable shelves. For adjustable shelves I use Sugatsune Shelf mounts. This is well engineered and is solid for the storage of books for example.