These inserts are for two cabinet doors. It's a very traditional style that lends a nice touch to a glass door. I did these in Basswood as these doors are getting painted with an antique glaze as the finish. The mullion strips gave me approx. 1/2" from the surface of the glass to the face of the door. Not much to carve into but they worked out OK. The thinnest area is just about 1/4 " and the thickest is 5/8".
The trickiest part was getting the 8 points of contact carved to fit perfectly to the mullion strips and curves around the arch. Once that was done the rest was a piece of cake.
The photos show the initial bandsawed piece, roughing out phase, fitting the contact points and the finished carving in the last two photos. A bit of sanding here and there and I'll call it done.