I'm kicking around the idea of building up a fatbike on a budget... but how bad of an idea is this?

I'm looking at buying a cheap off-the-department-store-floor fatbike. I'd then upgradem basically everything except the frame, fork, and cranks/bb. I'd have to buy a wheelset and tires, but everything else I have in my garage or can pull off other bikes in the short term.

All told, I could do it for ~ $1000. Build would look something like this:

• Generic frame and fork, probably alu, but possibly steel, generic headset
• Generic cranks/bb
• Stans wheelset, Surly or Specialize tires (I'd have to buy these).
• disk brakes - I've got hope hydros, magura hydros and avid mechs in my garage to choose from
• thomson post, easton bars and stem
• Specialized saddle, oury lockon grips
• X7 shifters and rear derailleur
• 1x10 drivetrain w/ narrow-wide chainring
• SPD pedals

I figure the frames are mass produced and generally overbuilt, so the only "problem" with them is the weight and the ride quality (assuming no funky geometry stuff). Cranks are cranks. Everything else would be upgraded. Heavy frame, but tubeless wheelset... weight should be in the low to mid 30lb range (guessing).

For comparison's sake, if I were buying a good bike complete, I'd go with an Ice Cream Truck at ~$2700. Better frame, no doubt, better cranks, but equal or "worse" parts everywhere else, including heavy *kitten* tires/wheelset, which is really noticeable when climbing.


Thoughts?