I assume you mean
this?
since you talk about 50mm rims, I assume you plan on 3" tires? Did you look at the Jones bikes (since you have the H-bar)? since you plan to install new brakes, wheels etc. it may be better to just buy a frame?
I'm not a fan of SRAM brakes, but reasonable people like them. to me they would be another reason to build up from a bare frame.
Count on having to replace the novatec hub. ALL the cheap fatbike hubs (from Trek, Specialized, and all other bikes except the few that come with actual hubs) will break and then you get an actually good hub (DT, bitex, etc.). Don't tour with a novatec rear hub....
Edit: there is a note stating they ship October 15th. I'd inquire about actual shipdate assuming this is a mistake.
"
The Deal: bikes are available for PrepayShipsOct15-30th at this special price for limited time. Approx dates may ship earlier or later by a few days. See Pull down menus below. "