I can vouch for much of that build that build as a commuter. My very first commuter was built with low end 7 speed stuff looted from an old Trek 820 I broke the frame of as a kid, and a Nashbar AL MTB frame. Had BB7s too. Sun Rhyno Lite rims with Deore 525 hubs. Bike got a then-250lb me around for 2 years with nary a problem, and plenty of curb hopping and potholed city streets. Frame currently lives on as my MTB, now re-equipped for some more serious trail riding. Here she is shortly prior to being reborn as a dedicated trail bike, circa 2013: