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See the drawing and photo. We did this in 2 rooms, in 1 of them 2 paxes of 100cm wide just fit in the space to fill so bespoke doors were only necessary to make up the height. In the other room, the space to fill was narrower so the doors are also to cover the width.
@hugo7 you're right, these doors had edgebanding so I did them in MDF. The laminated ply was for a table top and some shelves which I cut with a chamfer so you do see the edge
cworkshop do a sheet of double sided white laminated 18mm birch ply for £177 inc VAT, or £198 cut up. I've used them for bespoke doors and sides for ikea pax wardrobes (incl hinge cutouts and edge-banding) see photo. They've a lot more finishes and a decent online pricing tool.