My First Tiptoe Into Tournaments?

Well, a tournament was posted on Facebook for 1,000 points at the second closest G.W. to me, so I've decided to give the ol' competitive scene another whirl. I'm the third alternate, which means I probably won't be able to play any way, but hey, worth a shot, right? The army I'm thinking of bringing is:

Lords
Warlord with shield, Ogre Blade, Foul Pendant (163 points)

Heroes
Chieftain, Battle Standard Bearer, shield, Talisman of Endurance (102 points)
Warlock Engineer, Level 1 Wizard, Dispel Scroll (90 points)
Warlock Engineer, Doom Rocket (45 points)

Core
40x Clanrats, full command, shields (200 points)
40x Skavenslaves (80 points)
40x Skavenslaves (80 points)

Rare
Doomwheel (150 points)
Warp-Lightning Cannon (90 points)

The army is a bit top-heavy, but I don't want to drop the Doom Rocket Warlock Engineer, and I can't afford to drop any other models. Maybe I should drop the Warlord's Ogre Blade and replace it with a halberd, but that will mean painting up a new warlord miniature. Another way to get some more points for more toys would be to drop the two Clanrats whose spaces are being taken up by the Warlord and Battle Standard. Every point counts at this level, and making that Warlock a level 2 mage, or adding a weapon team to the Clanrats could be a game changer.

Any way, more pondering will undoubtedly occur.