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@Smallfurry
The beltrings thickness is pretty much all inside of the crank spider. If you are running a 46 tooth ring, then thats not likely to cause a problem. To achieve a decent road gear though you'll likely need more than this, as the cogs cant be too small (because of the nature of the belt).
You may also find you need to run the beltring on the inside of the spider (central position of a standard mtb triple). I ended up removing a driveside BB spacer, to properly dial in beltline (needs to be spot-on!), while avoiding this. These things will of course increase your chances of chainstay issues.
MTB frames are built to accept a wide triple crankset as well as fat rear tyres. So their chainstays are designed accordingly. So it might not be a problem. It just needs considering. I would'nt want someone to spend money chopping up a frame only to find the system did'nt fit ;S