Hmm...
I think I would start with a mix of Olive Drab/Yellow for a base color and highlight with Dunklegelb. Maybe a touch of Desert Yellow on the most exposed areas for a chromatic effect.
But the OD would be where I would start to get that sickly green undertone to the scheme.
Finish that off with a Black/Green wash for the details to pop and you might have what you're looking for.
Im very interested to see how this turns out. :)
edit:
If it turns out too dark or not yellow enough you can spray on a a filter using water color paint. You'll have to seal it before touching it because water color paints rub off kind easy when applied this way, but you can change the tone easily with that method.
Experiment and have fun. That is my best advice. :)