I plan on using a piece of 3/4" walnut approximately 10" wide by 45" long to act as both a lower shelf and to act as a center stretcher connecting the two lower leg stretchers. There will be a cleat on the interior of both the left and right lower leg stretchers which will support the shelf.
I am not planning on placing anything heavy on the shelf but I am concerned about possible sag.
I thought about gluing lips on the front and back of the shelf which would span the entire length. I know that this is effective on bookshelves but I rejected this idea since I want the shelf thickness to equal the table top thickness (3/4")
Since the bottom of the lower shelf will be about 7" above the floor and not readily visible I thought about glueing two 3/4" runners to the shelf the same length as the lower shelf on either side of the cleats supporting the shelf. Or milling two shallow dadoes about 1/4 deep by 3/8 wide and inserting splines which would sit about 1/2" proud of the bottom surface
Any one have any comments on this approach? Any one see any problems?
All the best