I used the balloons to get the planks myself. Start at CW, take one log to pay for your trip to varrock (forgot the type but think it was willow), take a lot of cash (to pay the sawmill), take as much oak logs you can while staying under the weight limit (with cape and boots i think i was able to take 23), fill the rest with rings of duelling, run to the balloon outside CW, fly to varrock, buy you planks and tele back to CW. You will burn through your duelling rings but it beats the *** out of running between the sawmill and varrock bank.