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How about:
2 of the 30x20 430mm lengths, as side battens positioned to the front of the depth. There would be c.130mm unsupported depth in the back corners of the shelf...
BUT
1 of the 20mm MDF lengths as a crossways batten across the full (well 860mm of 880mm) width of the space, on the back wall, so that unsupported area would be small and you're unlikely to put huge weight right in the corners?
Cut the stained fencing panel (?) to width of 880mm, leaving the 40x40 edging piece on as the front of the shelf. Attach to the 3 battens on the wall, and screw the 40x40 into the side battens to help prevent sag in the centre.
Edit: this assumes the panel is a) deep enough to serve as the shelf and b) capable of being cut down without falling apart)
Awaiting critique...
This is what I have / willing to use.
Ideally I'd keep the 75x75mm posts and 40x40mm long battons, but it's not the end of the world.
I'll be using other shelves, but I'd like something I could possibly put my wine rack back on, or could at least take weight without thought.
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