Distance and size of plant would also be heavily dependent on the fault lines. Could be a very useful military tool for attacking particularly vulnerable places

Distance and size of plant would also be heavily dependent on the fault lines. Could be a very useful military tool for attacking particularly vulnerable places (if you can fortify a nearby position against enemy attack for long enough to build such a thing). Seems overly-situational without some extremely rapid assembly. Good for softish sci-fi, though!