I like the Lootas in the BW idea. But honestly, your BW with the
MA Big Mek +
KFF + Lootas is a big fat target and a points sink. It will draw 100% of your opponent's firepower on turn 1. If that thing gets wrecked, you're out a lot of points, and your
MA Big Mek has to walk. Maybe just put the Lootas in the BW, and drop some of the extras, and use those points elsewhere. Spread the threat around, and force your opponent to make tough decisions about what to take out. Then swoop in with the rest.
Another thing to remember is that the
KFF is very different in 7th edition now. When embarked in a vehicle, the
KFF only protects the vehicle he's riding in. No more
KFF bubble to protect your trukks. Oh yeah, and exploding trukks cause S4 wounds now.
A
KFF Big Mek or even better a Warboss on a bike is viable, if that's an option for you. 4+ save, Toughness +1,
TL guns, Jink, and fast. Not too shabby. How about a Painboy either with one of the Boyz units, or on a bike? Stick your Big Mek, or Warboss in a unit of 10+ Warbikers + a Painboy on a bike, and you've got a very fast, tough unit with plenty of
TL dakka!
What models do you have available?