I would venture to say that if weight was a real concern, this is probably not the bike for you.
That said, this looks awesome.
There are Lefty conversion kits for the Pugsley etc so I imagine it would, one way or another
Yeah, it should. P321 or Mendon Cycle is selling/making some Pugs Fatbike Lefty clamps for Lefty Max (clamped on, not bonded steerer clamps) forks. IIRC, Mendon (not affiliated, other than receiving awesome service from him) has some Lefty Max 140 alu forks with PBR dampers at a good price to go in those clamps. You just have to build the correct offset on the front wheel, and limit the travel of the Lefty Max fork so the tire doesn't hit the crown.
The forks are normally 140mm of travel, minus whatever it takes to clear the tire. For a regular 29er tire, the safe reduction is 30mm, leaving 110mm of travel.