This guy is all finished now.
The breather mask snaps onto the main mask using popper fasteners so was able to do away with the under harness. The dendrils just detach from their connectors.
The whole costume is being unveiled at Invasion Belfast 3 at the beginning of October so I'll post up some pics with the costume then.
Btw thanks for the kind words guys, it really means alot! Cheers!