Grimstonefire:
A random idea, a drill chariot thing with a drill on the front.
Here’s a video link for the idea! 
http://www.youtube.com/watch?v=r85sWHNbd_Y
Snotling:
Cool, first I thought, just a big drill is nothing special, but then I saw it from the side and the bicycle part looked pretty cool. would be an interesting daemoneater, maybe a mixture of the drill from Ramshackle games (http://www.battlefield-berlin.de/shop/Media/Shop/rsg_v25a.jpg) and the… Cycloblabla from SmartMax (http://www.battlefield-berlin.de/shop/Media/Shop/smax_23.jpg).
cornixt:
I made a mining drill as a unit filler:
Hashut’s Blessing:
You could always take a look at the Mole from Thunderbirds 
Have it be a land submarine with a giant drill on it 
Snotling:
Hey Grim, haven’t you build some Miners with a bigger drill in the past? I think I remember a WIP pic somewhere…
Grimstonefire:
I have a dwarf miner with a drill, and a skaven doom flayer. No drilling warmachine though.
Snotling:
hm… I forgot where to find the pics of both ^^