Remodeled a new-style broadside to look a bit more like the older ones. No green stuff required, just some precise cuts, plus a couple of the old missile launchers from the actual old battlesuit kits.

And for an even simpler conversion, a modern carnifex styled after old-one-eye. The main thing I did was reverse and repose the crushing claws to point inwards - again, with no green stuff! Aside from that, added an extra 2 horns to the head and rotated the hip joints to make it stand taller.