I love the idea of paving a tonne of power klaws with minimal units that just blitz forward blowing up vehicles as they go, looks VERY strong. Though, if i were to make a modification, it would be to put the big mek on a bike and have him behind the trucks and wagons to give 5+
inv to max vehicles possible. May also consider splitting up the meganobz into smaller 3 man unitz in trucks and having the warboss with some boyz instead to protect him int eh battlewagon, with an extra power klaw of course. You may have to take out a squad of boyz to do this though, but worth it in my opinion

or just take out the looters