i know how to make a custom monster for doom3
here is one of my character
1 - jenisarry Hipoly - Lopoly model , its rigging system (divx and media player required)
http://www.geocities.com/mtcb2002/assd.zip ~4mb
alternative link youtube
http://www.youtube.com/watch?v=jdHFS4htWYY
2 - 3dmax files(.max v8.0 )
http://www.geocities.com/mtcb2002/3dmodel.zip ~2mb
3 - i dont claim that im good at painting
http://www.geocities.com/mtcb2002/adasd.JPG
subNote:
im a universty student, Computer Engineering, its my frist year i know java as an intermediate user