Heads from the Blightkings box work on the Death Guard also. If your looking for a way to differentiate the second squad.
I took the big head and the nurgling looking head and attached them with GS Then made a GS tube coming out of the bug one. The effect works really well.
Otherwise, things look disgusting, as is correct. With the light box issue try putting a thin white cloth into over it to diffuse the light. Might help with the washing out effect on some of the colors.
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Forge World Sidera Maris project
Warhammer Age of Sigmar project
Horus Heresy project