Substrate for Vaneer Dash

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I’m starting a new project for my S, to re-veneer the dash. Common topic i know, but i read so many varying suggestions. Most are; do not veneer directly to steel plates as the veneer will split and expand over time but instead use birch, MDF or ply backing board (substrate). I’ve read 0.8 mm thick but god only knows where to find 0.8 thick x 2m long backing board. Or alternatively, does anyone have different with ideas or a better way. I found a nice chap at www.thewoodvaneerhub.co.uk for the walnut burl.