I would be very cautious of a recipe that called for 2/3 can of lye and not exact measurements.
Here is a recipe for an Oatmeal, milk and honey from millersoap.com
*Note on Milk Soaps: Milk and honey both can cause overheating in soap. When you make a recipe with milk or honey or both, you should only slightly insulate, or not at all. With a deep mold, I think I would completely pass on insulating. If you are sure the soap is at thick trace when you pour and don't insulate... hopefully, you won't get a separation like the one shown at the top of the "Botched Batches" page!
This was posted by Michelle M. on the Latherings Board in January of 1999. She based it on Rachael's recipe that is on the animal fats page. It calls for goat's milk, but you can use cow if that's what you have.
Oatmeal, Milk and Honey
48 ounces shortening (a 3# can)
18 ounces coconut oil
12 ounces soybean oil
10 ounces canola oil (olive can be used as well)
12 ounces lye crystals dissolved into 18 ounces cold water
One 12 oz. can of evaporated goat's milk added at light trace (for lighter colored soap with a firmer texture, you may use 6 oz. evaporated milk and increase the water to 22 oz.)
Temps: 95-100 degrees
Add at trace (Michelle):
2 ounces of A Garden Eastward's "Flower Power" (soaps very cinnamony)
3 T. honey
A sprinkling of cinnamon Add at trace (Kathy):
2 ounces of Sweet Cakes "Oatmeal, Milk and Honey" FO
1 cup pulverized (blender) oats
1/4 cup honey