Face Frames and a Double Panel

TOfay we finished making and fitting the face frames for the bookcases (ie for the doors to hang on), and also a small back panel which goes at the back of a display space in the middle of the right hand unit.  This panel looks like two separate ones butted together, but is in fact a single one with a shadow line down the middle.

We arrived at this panel design in order to make the cabinet it is fitted to harmonise with the pattern of doors on its sister unit on the other side of the fireplace.  Almost every design seems to have one particular sticking point, or "crux" which needs to be resolved to make the whole thing work.  In this case it was about how to make the two units go together perfectly even though one of them has an inconveniently sized hole in it to fit round a window while the other one doesn't!  The double panel is part of the solution.  This will all become clearer as the doors are fitted.....