ray_afraid said:
If any change was to be made, my vote would be to have the spider standing still for the first few moments, looking like a rooted plant, then become more animated as the shot progresses. (from McQuarries paintings, that's how I always imagined they'd have been introduced in the film)
^ Definitely the way to go. I also got a botanical vibe from the McQuarrie work, and dig the idea of the spider being more plant-like.