Juggernaut

I ended up acquiring a number of Chaos Space Marines, many of which are on Juggernauts. How are they represented in GDF, if at all?

I assume that Destroyer Armor is the equivalent of Terminator armor. That said, I think that might just be the easiest path, although having Ambush isn't very thematic. Or does that represent something else? If I dropped Ambush, how many points fewer should it be?

Note: I have not played WH40K in a long time and when I did I was not very immersed into the weaponry and lore, so I have few of the codices past 3rd Edition to reference.

Thanks in advance.