To fit the CK-20 into my 16x12' shed, I had to install a garage door on the 12' side (so now my shed has 3 doors!).
Problem was a 5' x 6' by 1.5 foot (in some areas) section of massive rock protruding right where some of my ramp would need to go.
I thought I'd share a 30 second clip of video of the Kubota mini and hammer my brother brought down. About 3 hours we had it level w/ grade.
CK-20 moved the rubble and it's a good 3 or 4 yard pile I've got of broken up stone. I put in the about 7' high garage door (shed company has custom install they did) and made a 3/4" crushed stone road and my own ramp to the shed. Came out great. Here's video of rock hammering:
http://www.linuxma.com/demolition/kubota_hammer.wmv
Here's the after pictures (the day I was fitting a PHD on the CK-20 for deck work):
http://www.linuxma.com/house_pics/full/DSC00774.jpg
http://www.linuxma.com/house_pics/full/DSC00771.jpg
The focus of those pictures are the machine and not the shed, but you can see how the door came out -- great setup.
That rock had some portions in "sheets" where I was able to smack it w/ a sledge and remove some of it, but after a little ways into it, it got into very hard material that was even tough for the hammer at some points.
The guy behind my fence is complete jerk (all 3 of us that border his lot can't stand him) and one day he said "I don't want to hear no motors on the weekend when I'm off work" or something like that. 3 hours of all of the glasses in the cabinets of the house "ringing" from the hammer vibrations was music to my ears. (I was hoping Earl (that's the jerk's name) was enjoying the melodies also).