CE Diabolus

Decided to give mechanitor a try and am at a stage of preparing for Diabolus to advance my mechs. Now here's the problem, what kinda firepower will i need for it? Right now I got 2 small auto turrets, 4 militors and a lever action rifle, all equipped with AP ammo (or slugs for the militors) and it is clearly not enough to put a dent into it.