It's a cool list. The only problems I can see are the Lord and the Gorax. In a 500 pt game, you're not likely to see too many living models for the Lord to Offer. There might be one unit on the field, and in a list with so few models, your Lord becomes a quick target. Second, the Gorax is much better when fielded with a beast rather than constructs. The constructs have nothing to offer the angry little... (rodent?) and he really has nothing to offer them back.
That said, I'd take your current list and twist it a bit to look like...
Kruger the Stormwrath
Worldwarden
Worldwyrd
Warpwolf
Shifting Stones
Gatorman Posse (5)
Farrow Bonegrinders (4)
(500/500)
Now, the loss of a Warden is big, but in 500 pts, the extra spam shouldn't hurt too badly. What you gain, however, should help quite a bit. The Wolf offers heavy hitting for big armor targets. Kruger and the Wardens can't really keep up and if the gators are tied up on something else, the Wolf comes in handy. Shifting stones give Kruger and the Warden something to arc lighting off of when the def is just too much to hit and they help repair Kruger and his Constructs. The Wyrd is a control piece if ever there was one. His animus will keep your opponents fearful of upkeep spells for the game (and he was the last model, pushing the points right to the line.) The only personal choice here is really the Bonegrinders. I'd field a minimal unit just for the extra 3" they give Kruger. Also, keeping them near your lock will help to screen him, adding do his already great defences. If all else fails, they can at least keep him from being charged and, who knows, maybe they'll be able to hit back for a bit... (Oh, and I hear grinding up a dead warbeast can be a good thing too...)
However, maybe I'm just talking out my arse here... Maybe I don't know what I'm talking about. This is all just conjecture I've picked up from reading the cards and pouring over info on Battlecollege and other various sources. I don't claim to have expierence playing them... Take my advice with a grain of salt and ymmv.
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