The WR 426 fork swap I done wasnt too bad, itd be even easier using a WR 426 wheel or hub aswell, also if you got SM rims laced to a WR 426 front hub you could use standard WR axle, caliper and just buy a 320mm caliper adapter to suit the full size SM disc. I was too cheap for this so made my own axle and caliper bracket to run standard DTX wheel, speedo drive and get the 426 caliper to work on the 300mm DTX disc haha.
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P3yDark
@P3yDark