Well, it would be up to you and your opponent to decide, but I'd probably go by the rules for building and ruins in the BRB, specifically P83. In that, it states that you have to be able to physically place the model in order to be able to move it. Using that, you would need a ledge, or you wouldn't be able to move them up 5" one turn, and 5" the next, but it would simply be impassable to you.
you could of course agree with your opponent before hand that it would be possible, as the idea of 'nids slowly scaling the walls is pretty cool, but otherwise, probably not, if only to keep things simple.
Also remember that you don't have to try to scale the wall with your movement if you couldn't make it normally. So, if you rolled a 5", which isn't enough to get up the wall, you could use that 5" movement to move you round the side or something, the movement isn't just lost.
[Edited for clarity]
It's all in the name.
Looking for a club in Brisbane, Australia
? Come and enjoy a game and a beer at our friendly club in a pub, Sunday nights from 6:30. All brisbanites welcome, don't wait, check out our Club Page on Facebook
for details or to organize a game. We play all sorts of board and war games, so hit us up if you're interested.
Update:From the 25th of May 2014 we'll be Meeting at The Junction pub in Annerley, opposite Ace Comics and Games
Still playing 40k, Warmachine and board games of all sorts!
Last edited by maddermax; 04-06-09 at 09:32 AM.