I have made a free standing six rack set of shelves for the pantry from 44mm square wood battens and 18mm MDF. Used a router to cut a set of 10mm rebates and tapped the MDF in and used a screw from outside to secure in place then painted in PVA to provide a little moisture resistance.
I was really happy with the outcome the shelves had a nice tight fit and I cut the rebates so I have a range of shelf heights to suit different requirements. Just got to put a fresh lick of paint in pantry and then I can move them in and put a securing clip to the wall.
That's my favourite method for making stuff, really solid and pro looking but quick and simple too.
Need to get a 1/2" router some day, will open up a few more possibilities..
Edit - Would be interested in seeing a pic of your shelves actually, got some to make myself.
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