Minecraft CC Place Plane

print("How far do you want me to build?")
local distance = tonumber(read())
print("How wide do you want me to build?")
local width = tonumber(read())
local blocksleft = width*distance

term.clear()
term.setCursorPos(0,0)
print("Are you sure? Press any key to continue.")
print("Total Blocks To Place: "..blocksleft)
local blocksininv = 0
for i=1,16 do
    blocksininv = blocksininv + turtle.getItemCount(i)
end
print("Blocks in Inventory: "..blocksininv)
if blocksininv < blocksleft then
    local blocksshort = blocksleft-blocksininv
    print("Blocks Short: "..blocksshort)
end
local projcomp = string.format("%0.1f",blocksininv/blocksleft)
print("Projected Completion: "..projcomp.."%")

os.pullEvent("key")

local function placeDown()
    local notified = false
    while true do
        if turtle.getItemCount() == 0 then
            for itemslot=1,15 do
                turtle.select(itemslot+1)
                if turtle.getItemCount() > 0 then
                    turtle.transferTo(itemslot)
                end
            end
        end
        turtle.select(1)
        if turtle.getItemCount() > 0 then
            break
        else
            if not notified then
                rednet.send(411,{
                    MsgType = "Notification",
                    Title = "Out of Blocks.",
                    Body = os.getComputerLabel().." is out of blocks."
                })
                notified = true
                print("Out of blocks")
            end
        end
    end
    turtle.placeDown()
    blocksleft = blocksleft - 1
    term.clear()
    term.setCursorPos(0,0)
    local totalbl = width*distance
    print("Currently Placing Blocks")
    print("Width: "..width)
    print("Distance: "..distance)
    print("Total Blocks: "..totalbl)
    print("Blocks Left: "..blocksleft)
    local completion = string.format("%0.1f",((totalbl-blocksleft)/totalbl)*100)
    print("Completion: "..completion.."%")
    local blocksininv = 0
    for i=1,16 do
        blocksininv = blocksininv + turtle.getItemCount(i)
    end
    print("Blocks in Inventory: "..blocksininv)
    if blocksleft-blocksininv > 0 then
        print("Blocks Needed: "..blocksleft-blocksininv)
    end
end


turtle.forward()
placeDown()
turtle.turnRight()
for d=1,distance do
    for w=1,width-1 do
        turtle.forward()
        placeDown()
    end
    if d ~= distance then
            if d % 2 ~= 0 then
                turtle.turnLeft()
                turtle.forward()
        placeDown()
                turtle.turnLeft()
            else
                turtle.turnRight()
                turtle.forward()
        placeDown()
                turtle.turnRight()
            end
        end
end