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It might be easier to make supports that you can insert (and maybe even move to allow a decorative effect). 1.25m is quite a span for vinyl. Try the sagulator to see if scaffold board would improve things in theory but supports could just be added to what you have there. You might need to add one inside the cupboard though.
Airhead
TvH
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.