I once did a relatively open shelf by making a form of French Cleat for the top rail. Actually, I'd probably call it an American Cleat as it doesn't involve any bevel cuts. What I did was use my biscuit joiner to put slots in the underside of the top rail of the shelf. I made a matching board with aligned slots in the top of it and screwed it to the wall with countersunk molly bolts. I used plug buttons to cover the screws. Biscuits are loose fitted into the wall part of the mount and the shelf hangs on the wall board with the biscuits keeping things from sliding around. I used #20 biscuits and the thing has been hanging in my Granddaughter's bedroom for about 10 years now with no problems.
Or.... you could use this situation as justification for buying a right angle drill to get in between the top rails.
The Nut in the Cellar
I've gone out to find myself. If I return before I get back, have me wait for me.
Last edited by Jim Frye; 04-18-2017 at 03:44 PM.
Reason: added blather