Updating this after reaching 70 and soloing all content. Updated yet again 11/2/2016: beginning to add video.
In short, this build is about using big gun damage, Laser Guided, Overcharge, and Targeting Scope to turn Wilhelm into a devastating Flayer user. It’ll work great with any gun, but the Flayer, Maggie, and Machine become absolute superstars with this set up.
Maggie – try to get one with an 11 round mag.
Tranquility or Precision Oz kits, depending on area
Adaptive, Absorb, or Booster shields
Viral Marketer for armored bosses
shock Practicable Face Time is ideal for shielded bosses, shock Machine is also great
I have used this to solo all content at 70.
Deadlift… this kind of demonstrates the need to buy time to recover: