In making several of my projects compatible with Project Q, the biggest hurdle has been making the blueprints (ERF) file since the 2DA number schemes are typically off. I've found these two tools to be of immense value in making this a non-issue:
ERF utility by roboius located
here : extract all the blueprint UTP files out of an ERF.
GFF2XML and XML2GFF by tk102 located
here* : convert the UTP files extracted to XML and vice versa.
Once in XML format, I can just whip up a quick Perl script to run thru all the files and change the appearance offset to make a new set of blueprints, then convert back to UTP and add back to a new ERF. It takes all of 5 minutes now to create a blueprint set to be compatible with other community content.
* there's lots of other goodies on the KOTOR modding page that works with NWN.......