Igloo 120 qt cooler

Has anyone used one of these as a MLT? Any issues with retrofitting the drains etc for a manifold?

http://www.walmart.com/catalog/product.do?product_id=3512888

I looked at them...but unless I was going to do like 20 or 25 gallon batches, I couldn't figure that I'd ever get enough of a "Bed" for my grain in something that big. It is almost 5X bigger than my 5 gallon Tun. The paltry little 8 or 12 # of grain I brew with would barely cover the bottom of that cooler.

Having said that....I'd sure like to mash 50# of grain some day...and that'd be just the ticket to do it.

I should have mentioned that I usually do 20-25 gallon batches, was looking for a new MLT that can handle the amount of grain I need to use.

I almost bought that when i got my first MLT at walmart. But for a 20 gallon batch it would be perfect i think