if u have done the quest for crystal saw, you can just lvl up to 69 with the boost of tea and saw (+6) the fastest training method is oak larder but u may need 11820 oak planks to get 72 cons (if u haven't done the quest The Eyes of Glouphrie ) the slowest but cheapest way to get 72 or 69 cons is using limestone which i don't recommend then with the boost of tea form the Wooden Shelves 3 (3 teak planks, 6 soft clay, 2 gold leaf (260K gp)) at 67 lvl u can make the alter but since you are only planning to get 72 or 69 cons u should get sc hammer and crystal saw that reduce the cost a lot