Alien Model (with collisions?)

Lately, I've been wanting to do more extensive rigging. So, heres a model I'm almost finished that I've been working on and off on for the past few days.



Why is its tentacles up you might be axin'. Well I'll tell ya: I'm not sure how I'm going to rig them yet. Its a choice of either IK/FK controls or dynamics and hair/fur systems. I can always set something up to switch between the two (four) options, but I'll have to figure out how to do that. Heres the character model sheet I drew up