I plan on using some egg-and-dart oak molding that will tie in with other molding I have added in the kitchen. Under the tile itself I thought I would use some masonite or plywood. The tiles are a little thin, maybe 3/8 inch, so I think they need some backing. I’m not sure how I should attach the molding to the base, whether it should be recessed or whatever. If the base is recessed, I would have to nail through the sides of the molding: therefore the base material would have to be thicker. Or could make a corner block. The egg-and-dart molding is rather thick and substantial.

And should the tile just be glued in? Since it will conduct heat I need to have a glue that will not weaken with heat, so the tile won’t fall out when hanging someday.

For hanging I was thinking about using a keyhole-type insert. Is there anything that would be better? Thanks in advance!

Thanks for your response, bobsmyuncle.
I do overanalyze, that’s true. What concerns me is that I want to be able to hang it on the wall, so don’t want to have the tile drop out. Has anyone made a hanging one? I had not thought of Goop, I do have some. I don’t have the equipment to rabbet, but having a wooden base under the tile will work as well.