Cabinet door material

Hi John,

I need to make a few kitchen cabinet doors to match existing (very old) doors.  The doors are flat slab with a roundover about 1/8 inch wide on the edges.  They are 3/4 inch thick and half-overlay type, and they are painted.  The largest door I need to make is 15 inches wide and 32 inches long.

It seems that Baltic birch plywood would be a good choice, but I'm not sure about eventual warping.  The doors don't need to last forever; this is an interim fix until the owner (my daughter) can afford a full kitchen remodeling in a few years.

What do you think?

Thanks.

Alan