In an earlier contribution to this discussion,
Marcus Fox wrote:


There is nothing to screw the front support on to, as the side batten
supports run right to the depth of the chimney.


Why can't you support the front re-inforcement off the side battens - with a
halving joint, or something?

Actually, if you screw a length of angle to the underside of the front edge,
it doesn't really need to be supported - but it will still stop the shelf
from bending in the middle. In other words, it won't be holding the shelf up
(the battens are doing that) - but it *will* increase the bending stiffness.
--
Cheers,
Set Square
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