OK, I've never tried to draw one of these before, but something like this isn't terrible, in that it achieves the main goal of not getting a gutter runner blitzed on turn 1, which is nice, and also prevents getting surrounded. Of course, against a dashier team, it protects the sidelines but unfortunately means that if they knock down the guys on the lines they can saunter up the middle. But it's kind of my default.
Also, if they have any Frenzy, you can't use this or you get surfed right away. If they do, you have to either concede the sidelines or allow a gutter to get blitzed.
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. s . . l . . . t . . s .
. g . . g . . . g . . g .
Edit: And no, this doesn't keep all your ag 3 guys from getting marked on turn 1, but usually you can hit 'em back a few times if they do this and make them think twice about doing that again. Not to mention that if they choose to lock down 3-4 guys just marking your stormvermin and thrower and stuff, that's 3 or 4 (presumably big strong) guys who can't help protect the ball against your gutter runners, so they're sort of playing into your hands doing that. Remember, with Skaven, it's all about the ball. You can't outmuscle anybody, but the trade off for that is that anything less than a double super cage with all 11 bashers is vulnerable to your amazing speed and pluck. =)
And if all else fails, you can pretend you're elves for a turn and dodge everybody away and build columns, but obviously that's not great. =)