It is how you fix the 13th floor import .pl. Columns have to match 13th Floor data file. As for merging, that's an individuals problem.
All I did was find a way to get the latest 13th Floor into a raw, non-customized Items table. The extra columns are new attribs for (maybe) the newer items from that data source.
Then, ran into problems with nearing the max item ID ceiling, and this thing on Linux which I have had no time to look into. If you can fix it, great!