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Sorry, but this is an awfully complex way to do something as simple as making lye. It's expensive, too, when compared with the traditional ways we used/use on the farm.
It's simple. Fill a bucket or barrel with wood ashes, preferably oak. Tap a hole at or near the bottom. Slowly pour water through the ashes, catching the "son-to-be" lye as it runs out the hole. You can either filter with a cloth or screen as it exits the first container or when you pour it into a kettle to further reduce the filtrate into true lye over heat (You're removing excess water by heating.Bonus: After you've cooked the filtrate down, re-filter if necessary to remove foreing particles, add lard, glycerin. mineral oil, or vegetable oil - add herbs or fragrances if desired, cook it down to a thick consistency, pour it out to flatten and harden as it coos, the cut. Soap!
Or! If you're lazy (as I tend to be) you can go to hhttp://www.antipodesmap.com/ and click on or enter your address