What the hell! Skaven!

This must be some crazy shit, but I just involved in Skaven too!

My friend gave me a whole bunch of unassembled Skaven stuff and that's enough for me to really get started on the army.  A few bucks here and there and I should have a huge army.  That's pretty good considering I didn't spend anything on the Ogres.  My only problem is.. I have limited amounts of experience with and against the rats.  I've been developing a list lately and it looks something like this.

Keep in mind that I have rules!

• The first rule is that I wanna take Queek Headtaker because I like his fluff and his rules.
• I will not be using the Hell Pit Abomination.  I hate the model, hate the rules and I don't want to hear people bitch.
• Out of all the clans, I think I like Clan Pestilens the most.  Hence why I have some of the Poison Wind stuff.

Here's the list:

2500
14 drops

LORDS:
Queek Headtaker = 215
Lv.4 Grey Seer (Scroll) = 265
Lore of Ruin

HEROES:
Chieftain (BSB, Shield) = 72
Warlock Engineer (Brass Orb) = 65
Warlock Engineer (Doomrocket) = 45
Lv.1 Warlock Engineer (Condenser) = 85
Lore of Ruin

CORE:
35x Super Stormvermin (FC, Razor Standard) = 455
35x Clanrats (FC) = 242.5
+Poison Wind Mortar
35x Clanrats (FC) = 242.5
+Poison Wind Mortar
40x Skavenslaves (Musician) = 82
40x Skavenslaves (Musician) = 82
6x Giant Rats (Handler) = 23
6x Giant Rats (Handler) = 23
6x Giant Rats (Handler) = 23

RARE:
Doomwheel = 150
Doomwheel = 150
Warp Lightning Cannon = 90
Warp Lightning Cannon = 90
Plagueclaw Catapult = 100

My biggest problem is that I don't know what's acceptable as core and what formation the units will be in.  I know how to do elite and expensive armies, but an entire made of random fodder is new to me.  I mean, look at how many models this is!  It's insane..

The Super Stormvermin is upgraded with Queek's benefits.  WS5, S5 with Halberds and Razor Standard is pretty insane for damage.  Right now, I'm thinking about putting them in 7x5 formation.  Does this work?  Or should I spend the points to get a bigger unit in general and put them in Horde formation?

What about the rest of the core?  Clanrats should be 5x7 deep and Skavenslaves is 5x8.  How does that look?  The Rat Darts are there for deployment reasons and the rare slot is filled with all kinds of crazy contraptions.  Doomwheels do good amounts of damage once they start blasting into combat and I've seen Warp Lightning Cannons do crazy stuff.  The Plagueclaw is there to drop Large Templates (great vs. Warriors of Chaos!) with no armor saves and the rest of stuff is pretty self-explanatory.

Thoughts?  It looks pretty solid to me but I'd like to know your opinions.

PS - I must be crazy to take this army with so many projects already.. but the price was just too good to pass up on.