These are exquisite looking doors ... glad you are offering the construction details since on my list of projects is doing something very similar: entry door with sidelights. There seem to be several suggestions for dealing with the potential for warping with door such as this, things such as "sandwiching" a plywood core between hardwood exterior. Do you have any concerns about the potential for warping or is this just not an issue with your construction technique?
Thanks,
JR
Thanks,
JR