I've spent a good couple of hours really trying to work out how to use the Handplaced Override and the Volumetric Override. I've peeked through what I could of the node and tried most combinations of inputs trying to get them to work. Currently I'm trying to use a VDB as the Bounding Volume, but prior to that I tried all sorts of other combinations to try to override the bounded segments of the building and replace their modules.

I'm at wits end at this point and am hoping someone has had some experience with this node that could help out with getting this working.

I've included the .hiplc to try to speed things up as much as possible.

i just stumbled across this entry. maybe someone else has the same issue as you to make the volumetric override work.
1. insert the bounding box (geometry, like a box) into the first input of the utility node
2. switch to the volumetric tab and insert the module name you want to replace
3. connect the utility to the 4th input of the building generator

this page helped me to solve this issue

https://www.sidefx.com/tutorials/building-generator/ [www.sidefx.com]