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Big Dummy Spec:
- 18" Surly Big Dummy frame from Bow Cycle
- front wheel:
- Mavic XC717 32H rim
- Shimano XT disc hub
- Avid 160mm rotor
- Schwalbe Marathon XR 26 x 2.0" tire
- rear wheel:
- Mavic EN325 32H rim
- Rohloff Speedhub [black, OEM2, disc, external gear box, 16T cog]
- Rohloff 160mm rotor
- Avid BB7 mechanical disc brakes
- Avid 3.0 levers
- Avid Flack Jacket rear brake cable & housing
- No name teflon front brake cable and housing
- Titec H-bar
- FSA Orbit XL-II headset
- Nashbar comfort stem
- Planet Bike Cascadia ATB fenders
- Race Face LP Turbine cranks [44T soon to be 38T chain ring]
- Race Face ISIS BB
- Wellgo BMX platform pedals
- Rohloff XC chain guide & XC chain tensioner
- Selle Anatomica saddle
- Easton seat post [27.2mm]
- kickstand
- Planet Bike Superflash LEDs x 2
- Dinotte Lights 200L-AA
- Xtra Accessories:
- v-racks
- freeloaders
- snap deck
- wide loaders
- tray bien
- long loader [left]
- footsies
- disc caliper protector
I mounted some Planet Bike Cascadia ATB fenders on my Big Dummy recently. They look great and fit the 2" Marathon XRs well.
The rear went on easily without any modifications and fits the BD frame perfectly. The fender struts are touching the BD frame so I'll put some electrical tape there to keep them from rubbing through the paint.
I mounted the front fender to the mid-fork braze ons - avoiding the disc brake caliper entirely. However, PB provides hardware to get you around the caliper if you want to use the lower mounts.
One issue I ran into is the massive amount of clearance in the BD fork means that if you mount the fender to the fork crown as you usually would you end up with a huge gap between the fender and the tire. It looked goofy so I made a small bracket from a scrap of metal to lower the fender closer to the tire. 
