Ikea Hemnes display cabinet drawer depth?

Hello,
we are considering decorating an entire living room wall with Hemnes.
Does anyone know the exact depth of the drawers inside the display cabinet?
Has anyone ever tried to mount 2 wall shelves one above the other above the TV bench?
Has anyone ever extended the Hemnes upwards, for example with the wall shelf?
Does anyone have any other ideas for extending upwards?
Thanks!!!

Milli74

Hello, according to the assembly instructions, the drawer is as deep inside as the attached rail is long. This has a length of 385 mm. There is nothing to prevent hanging any number of wall shelves on top of each other at any height on the wall.