After many useful lurks , I have a world first project that is worth sharing with the forum.
I have pulled an old enameled wringer washing machine apart, welded up the agitator hole, cut stainless mesh and insulated it. I now have a super efficient(90%) large capacity and non plastic beast of a mash tun. It is not finished yet, it needs a pivot and pulley to lift it when I fill it with grain. Lots of these machines on ebay in the U.S. Photos are at http://www.forum.realbeer.co.nz/forum/topics/mash-tun-out-of-old-agitator?xg_source=activity
I was a bit lazy and just linked up to realbeer nz (as above), the photo's are attached there. The drum holds about 100L, you can see from the photo with the grain in it (45 L) there is lots of room. I think I could probably fit two 50L keggles of mash in there.I am going to make it more tech looking with shiny insulation and block and tackle so I can lift the weight.
I was disappointed by the picture...I didn't read the original post carefully and had thought you were mashing /sparging in a washing machine (like a working washing machine with the agitate cycle for mash and spin cycle for sparge!) now that would be awesome!!!!
Second brew using the washing machine lauter tun, made a 60 L batch of pale ale using citra/amarillo/riwaka. Its fast, efficient (94% extraction) and easy to clean. I love it, if I can get a bigger keggle, 100L batches!