Do keep an eye on those boards. I've got some bendy 12mm ply in stock right now because I left it standing on it's edge on site a few weeks ago.
It's hard to see from here but if it's well supported and quite dry in your garage it should be fine.
The reason for building it was to elevate and provide support behind.
They’re all 18mm or 20mm boards so less likely to warp anyway.
I've got a load of wobbly thinner ones that I'm struggling to design furniture to use. I have had some issues with 18mm in the past but it's always heat and damp related.
@Soul started
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Do keep an eye on those boards. I've got some bendy 12mm ply in stock right now because I left it standing on it's edge on site a few weeks ago.
It's hard to see from here but if it's well supported and quite dry in your garage it should be fine.