thanks
i was thinking
40k, with several types of undead ork

.
theres the zorks, basicly zombie orks and count as slugga boys
skorks, skeletal orks, shoota boys (made from the remains of weirdboys and so shoot bolts of waaagh energy)
the big nek, a big mek that has a thing for necromancey
da frankenboss. a frankensteinesque warboss made from bits of other orks stappled, bolted and welded together before being brought to life with suitable amounts of WAAAGH! energy.
for the zorks i would probably use greenstuff and
VC ghoul parts and for the skorks i would use parts from the tomb kings.