"MS Paint art.

There's something loose in the walls. You should have known when you saw them. These walls are as good as a sturdy barrier. And you've just ran into the one who put them up.

Well, then what happens when an ATP Engineer gets magnified?
A Mag Engineer happens.

How I think a Mag ATP Engineer would be like.

He engineered mechanical legs for himself, which contains his tools at the tips of those legs.
He'd be the one that's behind the larger floorplans and equipment, managing to put up and fix big structures or wide sections across the facility. His larger size means faster construction, and he's often lurking within the gaps between places to keep those wires and systems in check.
You know those giant ceiling fans? He put those up.
Oh yeah, and mag agents with technological equipment on their figure (looking at you, V4), as well as mag tablets come to him to get their stuff fixed."