At beginning of the game build a castle of 1 stone and 1 wood or as low as
possible. As soon as it is built extend it and make it so you need 100
stone and wood. You don't need to let it build, as soon as you leave the
castle screen demolish the castle. This will give you 65,000 tons of stone
and wood.
Hex Editing - Load the savegame into the hexeditor and change the
offsets 87.990, 87.991 and 87.992 to FF. Now you should have enough money.