There is a very similar project posted on another site (ha ha), I was showing it to my buddy last weekend while we were up at the lake winterizing our boats. He and I built an interior door almost exactly like it for his lake house last year except it was made out of pine. Instead of glass panels we used 1/2" pine plywood (special order). It is a sliding door on barn door tracks. We rabbeted one side of the openings with a router and put trim inside on the other side to sandwich the panels in. One side needed to be flush because it was a sliding door so we made both sides flush. The only other door in the room was an original door from the 1940's and he wanted to match it. The door weighed 70 lbs. Built the entire door with a track saw and Domino.