Very cool model, and nicely built! Thanks for posting!
This is a great example of something I feel is often overlooked in card modeling: the importance of display. A model sitting on a shelf or table just does not have the impact of a model put into some kind of visual context.
Check out the display base for this facehugger. Structurally, it's quite simple, just two "slabs". But look what it adds to the visual impact of the model! Much more exciting than if that facehuggger was photographed sitting on Oliver's cutting mat. It also helps that the base has very high quality graphics.
As for the critter itself ... I've always wondered just what they used for that in the original movie, does anyone know? To me it looks a lot like a horseshoe crab with its shell removed.