Shifted all the sleepers:
Unscrewed / cut off the screws in them:
Each is nom 2.6m long. The veg patch will thus be nom 5.2m wide.
The rough plan is this:
Level sleepers surrounding the beans. A 25mm square box section frame, put together with 3D printed connectors. This to be meshed over to deter the rabbits, deer, pigeons etc but let the pollinators through.
Then a close spaced, 2 copper wire "loop" attached to a battery, possibly solar charged. This for a slug/snail barrier as seen all over YouTube.
Not sure how the stripped copper wire will fare as in going green and tarnishing? Periodic cleaning?
Maybe too a 25x3 copper strip all the way round the base frame as well. Or do away with the wires and have 2 copper strips on the vertical side with a slight gap between and connect that to the battery?