Huggie, the main problem I see with your models here is that they look too mechanical. The general RP/lore behind the Scorpion is that it was designed as an unmanned probe-type craft that can be controlled remotely by either Nomad forms or by Incubi. As a Nomad-designed vessel, it should keep a similar flowing, organic look - your models use too many sharp angles and flat areas. More curves and rounded surfaces would fit the design better, IMO.
Also, I always liked the idea of having the scorpion's "Brain" (or it's control node, rather) visible, but it should still be protected somehow, not exposed to attackers. Encased in a shell or something, maybe.
The vessel itself should be composed of a mix of the rock-like material used on nomad gates/bases, and the jello that the nomads themselves are made up of.