I'm bringing you a new kind of mod that will allow you to select/place Asteroids into your crafts in SPH/VAB!
To select the "Potato like Rock", just go to the Science Tab.
This is a Work in Progress, so expect some bugs, such as:
-The Attachment points may seem a bit glitchy and a bit offset in the SPH/VAB, but thats because the asteroid is smaller inside the SPH/VAB.
-Due to the Asteroid's shape, the Attachment points still require a bit of trimming and may blow your craft up!(You can, however disable crash damage during the launch).
-To Avoid Glitches, just use the asteroid as a "mining well", that is, place it on the runway and use other crafts to harvest its resources.
Hope you enjoyed the mod!