Wass

local tArgs = {...}
local height = tonumber(tArgs[1])
local length = tonumber(tArgs[2])
local up = true
local slot = 1

turtle.select(slot)

for j = 1, length, 1 do
  for i = 1,height,1 do

    if turtle.getItemCount(slot) == 0 then
      slot = slot + 1
      turtle.select(slot)
      turtle.place()
    else
      turtle.place()
    end

    if i < height then
      if up == true then
        turtle.up()
      else
        turtle.down()
      end

    else

      if j < length then
        turtle.turnRight()
        turtle.forward()
        turtle.turnLeft()
        if up == false then
          up = true
        else
          up = false
        end
      else
        if up == true then
          for i = 1, height - 1, 1 do
            turtle.down()
          end
        end
      end

    end

  end
end