This the old layout, really messy
, currently don't have the photo of the latest one yet as it has different layout with deep shelves on the top are placed at the bottom filled with old analog T&M gears as these need at least 40cm depth. The ceiling is 3m height.
Its made from metal brackets (details in photo) and 2cm thick plywood, with 4 steel bars for the bracket attachments are permanently bolted & attached to the flat concrete wall.
Few shelves have different depths, on the top the two shelves are 50cm depth and gradually shortened to the bottom ones with the depth of 20cm to the back of the wall. All are moveable as I can change the layout if needed and now its totally different.
The four top shelves are strengthened with horizontal hard wood at the bottom in front to minimize bowing if heavy stuff placed on top of it.
PS : Yes, at the front, there are two "thingies" wrapped with with plastics are Tektronix analog scopes.