This is the best I could do, I bet it has something to do with the incredible scaling up that has to be done.... at least he shows up, he is not over his own shadow and his position is off.
;header
desc = psi zombie
;ai
aiinit = appear1.fpi
aimain = peoplecautious.fpi
aidestroy = destroyfadecorpse.fpi
aishoot = peoplecover.fpi
soundset = robotic
;spawn
spawnmax = 0
spawndelay = 0
spawnqty = 0
;orientation
model = zombie.X
offx = -20
offy = 0
offz = -20
rotx = 0
roty = 0
rotz = 0
scale = 3000
fixnewy = 0
;7000
;cone of sight
coneheight = 53
coneangle = 50
;visualinfo
textured = zombie.tga
effect = effectbankbumpbonebumpbone.fx
castshadow = 0
transparency = 0
;decals
decalmax = 1
decal0 = bloodgreen
;identity details
strength = 100
ischaracter = 1
hasweapon =
isobjective = 0
cantakeweapon = 1
;bodypartslimbinfo (1=head/2=body/3+4=armslr/5+6=legslr)
limbmax = 0
;animationinfo
animmax = 12
anim1 = 2,20
anim2 = 22,36
anim3 = 91,103
anim4 = 106,115
anim5 = 137,169
anim6 = 170,200
anim7 = 38,47
anim8 = 59,75
anim9 = 78,88
anim10 = 117,128
anim11 = 129,136
anim12 = 160,115