a true iwagumi layout will most likely cost you a lot man. cuz most of the time people do those layouts buy ada tanks, high light, glosso or hc as carpet plants. expensive scape rocks, co2, canister filters, lily pipes. because it wont look as nice if you have regular tanks and bulky equipments. they normally try to hide all the equipments making the tank as clean as possible.
but heres a good example of a member over at plantedtank.net layout