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It's possible the plywood will start warped, and even if you pick a sheet off the rack that looks perfect, when you cut it it might decide to banana then as it had built in residual stress.
If its smaller doors would probably be aight but I'd be cautious / be prepared to accept not mm perfect alignment of edges on non hinge side if full height.
@dbr is the expert though so he might come and tell me I'm all wrong.
Hovis
Kitchen cupboard doors: I can't find ones I like at a good price. If I get 18mm ply cut to size and fill/sand the end grain then paint and varnish the whole thing, will I prevent it warping?