X= STONE (when off)
X= Glowstone (When on)

Basically give another block a state like the portal blocks have. (open/closed)

or for a better example, redstonelamp on/off - Would show the portal activating.

It has been decided that, should animated customisations be a feature, they would probably be best situated within the Stargate Customizations module.

For that reason, I'm going to close this issue and instead track animation-related features as stargate-rewritten/Stargate-Customizations#13