In article , The Night Tripper wrote:

[snip]

The shelves will only be about 400mm long by 150mm wide. They will be
suspended in an alcove and I would guess tensioned wire of 2-3mm would be
plenty, if I can get the arrangement right.

Plenty overkill. I've only got 6mm holding up the mast on my boat and
there are tonnes involved in the forces acting on that... well, when the
sails are up and the wind's blowing... Just avoid sharp corners/bends
and pinching it too tight in your clamps.

Justin.

--
Justin C, by the sea.