Pre mashing

[Greenrvrshine]

I'm gonna attempt my first 100% corn liquor tomorrow. I've got 10#s of malted corn and 2#s I'm gonna crack to go with it. I'm doing similar to nchooch but instead of cooking my corn (as its already malted), I'm gonna grind it up and and hold it at 150 as long as possible (3-4 hours) and let it bring itself down over night. If I pre mash, do I need to use the water I pre mash with or can I drain it off and use fresh water. To further explain, my only pot big enough to hold my mash is my boiler with an element and I dont want the grain coming into contact with it. So my plan is... Pre mash my corn 24 hrs, bring my water up to 180 and throw it in the cooler. I'll have ice and boiling water on hand to adjust after the next step when I throw my freshly ground (with the pre mash water drained off) malted corn (and cracked corn) in. I'll keep adding hot water for the next couple hours and stirring. Sound good?