Don't forget min_extent and max_extent to find corners of bounding boxes for 
objects. I think this might be what was being sought after. Just be sure to 
read the help about those not being accurate for all instances.

A file called transforms.inc exists, located in POV\Includes, which could be 
used. The macro Center_Trans() will align to an axis or axes (says x or x+y, 
x+y+z is also possible).

Declare your CSG first, then use:

#include "transforms.inc"

object {
    CSG
 Center_Trans(CSG, x+y+z)
}

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