most people don't use their personal e-mail here due to spammers, etc.
Mostly people use Xfire or PMs to get stuff around.
As for the H3 Scarab, you would firstly need a Halo 3 Scarab, which I haven't seen around...
As for the .actor_varient, you would either:
Make the scarab a biped or,
Make and AI drive the scarab.
I think making AI drive the scarab would be easier as you wouldn't need to rig the scarab.
And for animating,
There is a whole list of tutorials here: http://ghost.halomaps.org/tutorials/
Just find what you need.