The Sons of Muspel gather

I've assembled enough figures to expand my Sons of Muspel army by another 24 AP.  I'd like to take these guys into battle with my original fire army for Hordes of the Things.  Ideally, I'd like to play a big battle, with my 48 AP of fire giants joined by another 48 AP of frost giants, taking on whoever in Ragnarok in a four-on-four battle.  I've fought against the frost army before; it would be fun to ally with them against a big Norse army.  And an eight-player game--96 AP per side--would be interesting since the largest HotT games I've played have been 3-on-3.  Now I just need to get these based...