Nice stuff. I guess the visor will be rigged to a bone
rigged in the center of the helmet.

Nice new Wordpress blog too!

Thanks Mike.
Here’s what I was planning to do:
Parenting the visor group (containing the visor and the grip knob - not shown) to the helmet
For rigging the opening/closing of the visor, I am going to offset the local rotation axis for the visor group so that it rotates along the outer surface of the helmet along the X axis. I’ll lock-off the Y and Z and limit X’s angle of rotation to line up with the length of the slot in the visor cover.
For animation controls, I’ll make a slider manipulator that is positioned above or beside the helmet.
I’ll probably use joints for the chin strap and maybe even the ear-pieces to give them the ability to flex a bit.
I’ll put something together for a basic rig and post here for all to see (and comment - hopefully).