Bob, I am jumping in on this because you have been hanging there for awhile.
I do not understand the term Shadow Box picture. I have built shadow boxes, but shadow box picture is a new term for me.
Anyway, it is very simple. Do you want a pane of glass in the box?
I am describing the method using glass. Go get some molding that is plowed to accept a pane of glass. Then cut your self 4 45degree corners. Insert the glass, glue and clamp the corners together.
Build the box itself to the measurements of the front.
Get a pair of nice brass hinges and then marry the two and you are set.
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