Used 3-gallon stock pot. Could only get 7 quarts of water in it with the 6 pounds of grain.
Strike temp was 164F, with a target mash temp of 153F. Had a hard time with temp control; started at 153 but oven let temp drop to 149 in about 15 minutes. Overshot on stove top (put it on "5") and got up to 160. Next time, easy on the reheat. Will probably just leave on stove top and wrap with towels. Any reheat will be done at lower settings.
Used two 5 x 26" muslin bags for grain; seemed very crowded in pot. 5-gallon paint strainer bags ordered for next time. Heated 1 gallon of water to 168F and sparged with it. Squeezed the hell out of both grain bags.
Re-steeped one of the grain bags in 3 quarts of water (about 1qt/#) for 30 minutes with temp hovering in the 150's during the main boil, and then boiled the resulting wort for 15 minutes. Used this to top off to 11 quarts in the pot; lost approximately a quart to filtering.
Filtered using sanitized, cut gallon water jug "funnel" and sanitized, 5"x10" muslin hop sack held in place with four sanitized binder clips. This worked very well -- flow was reasonable, and I could use the brew spoon to squeeze the wort out of the leftovers in the bag/jug. Tossed out all the hops and hot-break gook in the hop sack and rinsed out the jug. This is a winner for an easy filtration method that also aerates the wort.
Used Mr. Beer fermenter; got up to exactly the 8-liter line.
Overall, the brew went OK. It ended up over-hopped a bit according to the numbers since grain efficiency was poor at a calculated 58%. At this point I attribute the poor efficiency to the muslin bags keeping the grains kind of clumped up, and possibly the poor temp control. Will try again with an over-sized bag and using the stove top / towel method. I am trying to avoid a separate mash tun so I have hope this will work out. If not, I may very well use the bag in a dedicated cooler-tun to aid in cleanup.