Mission 5 now

I didn't screen, but my layout was something like, centre block of vulcan towers (max upgrade vulcan turrets), two DCA (Second to top level), a plasma turret (Second to top level) and a max upgrade missile tower:

V = vulcan towers
D = DCA
P = Plasma Turret
M = Missile Tower
# = nothing.

#VV#
VDPV
VMDV
#VV#


Then I built a maze around it of vulcan towers 'n' shiz...