Since Chad likes the idea, here is what i have thought about the scenario but i don't have the time to do it right now myself (i prefer playing the newly acquired Umenzi

).
Anyway, i think that a big force of Goblins and Orcs (maybe 2500-3000 points) with two Goblin Chukkas will attack a fortified cliff side with the entrance to the mining complex on the top. The dwarven force will be something like 1500 points, mainly cheap units since the complex was not expecting the attack.
After the first two turns or something, the dwarven player rolls a die. If the result is 5+ then at the start of the next dwarven turn, 3 (or more, you are the playtesters

) units of miners are deployed to a random table edge (except the deployment zone of the dwarves of course) returning from a mining expedition, rushing to the help of their comrades, onve they heard the noise of battle and saw the fires of the Orcish army.
For each turn after the 2nd one, the dwarven player gets +1 at his die roll.....
This is my idea, i will really like to see it developed by you

Cheers m8s!