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I had one of these moded M770 cassettes from Walt ([http://waltworks.com/2010/05/xt-cassette-mods/](http://waltworks.com/2010/05/xt-cassette-mods/)) and while it wasn’t a 500% range by optimizing the front ring I had a good range, it worked to deliver 5-speeds on a King SS hub and all the cogs were on a carrier so no freehub damage = awesome.
Also important, a Shimano shadow derailleur would shift up to the 34. The problem with building a wide range low-cog-count cassette is that the modern Shimano and SRAM derailleurs can only shift a big cog inboard - at which point you might as well have 11x of them?!
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