With an incomplete preview pdf, this is what I think would be really cool.
Inspiration after reading about BuFFo's games over at http://awesomesaucestudio.blogspot.com/, the crazy flesh moulders look fun.

5-7(depending on Rakarths roll) units start with 2 pain tokens, so FNP and FC, which makes wracks pretty deadly, 4+ wound, with a reroll at I5 on the charge. Who cares if they can't shoot much?

I like that this only uses units from one branch of society, though the grotesques seem cool, I don't know if two units is really needed.
A few small squads of scourges might be better to keep the mobility and to actually have some shooting.
Or some trueborn instead, and max out the wracks and maybe mount them, while giving the trueborn FNP to start the game with.

Any ideas? Not that I will be making this anytime soon, as no time/money, and as of yet no models, but it's fun to play with a new book.

1850
HQ
190 Urien Rakarth
180 3 Haemonculi , 3 liquifier guns

Elites
220 4 grotesques , liquefier , raider flicker
220 4 grotesques , liquefier , raider flicker

Troops
170 9 wracks , liquefier gun, raider flicker field
170 9 wracks, liquefier gun , raider flicker field
120 10 wracks , liqufier x 2
120 10 wracks , liqufier x 2
100 9 wracks, liquefier
90 8 wracks, liquefier

Heavy support
135 Ravager , flicker night shield
135 Ravager , flicker , night shield