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Boner Dicko
Currently, it's just a stack of cut out ply.
The plan is as shown in the sketch below.
Not to scale, but fridge slider on the left as my rear door opens on that side. Centre drawer is...

Make a series of three cubbyholes side by side with two layers of 19mm ply on top. You'll end up putting something heavy up there one day and be thankful for the second layer.
Make the cubbyholes...