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Yep. 38mm deep front.
125cm of records weigh approx 91kg. Sagulator my shelves will sag by 1.2cm.
I may add a few basic cut down broom handle supports per shelf. It will probably be better for the records if they are not leaning against each other too.I built the base cabinets fairly strong so I didn't have to use the wobbly internal lath and plaster wall to support any weight.
There is a cladding on the back wall with some carpet underlay behind to help with sound proofing.
Heres the before:
The heavier the better. How wide are the alcoves?
I made shelves for my 125cm wide alcoves in a similar fashion and they really aren't strong enough for vinyl or books. I used 18mm pine with a 38 x 18mm front strip. I may remake them from scaffold board.