User blog comment:Clockwork Tactics/Mech suits, are they allowed?/@comment-8395098-20140825153745/@comment-2253300-20140825162650

That wouldn't work. The IMperium has the kind of things that you are thinking of, those being Imperial Knights. However they are so valuable that their operators are given their own special status in Imperial society that is similar to Space Marines. You would never be able to justify putting hardware like that in the hands of Guardsmen.