go

size = 16
turn = "right"
total = 0
slot = 1
turtle.select(slot)
for x = 1, size, 1 do
  for y = 1, size, 1 do
    turtle.placeUp()
    if y == size then
      if turn == "right" then
        turtle.turnRight()
        turtle.forward()
        turtle.turnRight()
        turn = "left"
      else
        turtle.turnLeft()
        turtle.forward()
        turtle.turnLeft()
        turn = "right"
      end
    else
      turtle.forward()
    end
    slotcount = turtle.getItemCount(slot)
    if slotcount == 0 then
      slot = slot + 1
      turtle.select(slot)
    end
  end
end
for c = 1, size, 1 do
  turtle.forward()
end
turtle.turnLeft()
for c = 1, size, 1 do
  turtle.forward()
end
turtle.turnLeft()
turtle.forward()