MAD-ness' turret demos. 

Maps included are StoneHenge and IceRidge.

Stonehenge demo consists of several 4 turret layouts.

IceRidge includes the sought after 8 turrets in the basement layout for the IceRidge base.

Both layouts were discovered independently by MAD-ness but the 8 turret layout was reportedly first discovered by SDB-InfestedJimmy and Charon according to one source.