i did one in nov. of 2006, motivated by the same limitations you're talking about and inspired by randy mosher's book, radical brewing.
i split my grains in half (20# maris otter and 2# of biscuit) and mashed the first half at 151 deg. f. with 3.5 gallons of water. one thing to keep in mind for the second mash is that your tun will be retaining quite a bit of heat, so take that into account as you try to hit the right temp. i overshot it by about 8 deg. and had already maxed out the capacity of my vessel, which prevented me from adding cold water to bring it back down. oh, well.
i collected 6.5 gallons of wort and boiled it for 1.5 hours, hopping it with 8 total oz. of chinook and amarillo and ending with a 1.110 o.g. i don't know what kind of efficiency that is, but it was fun. it finished out at 1.024.
a year and a half later, it's just starting to get good. very rich and with a complex maltiness. i wish now that i had used english hops though.
if you're wanting to brew some strong beers with that tun, i'd highly recommend this technique, or you could just brew 3 gallon batches.
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