I'm not sure how else to handle the color codes.
At least the Ditzler numbers can be seen on the pages that are available on Ebay and turn up at swap meets and such.
TCP Global is pretty good about matching the color and they have formulas for many already. I'm sure there will be a process for converting this info to the newer water-based products. But they currently have the original acrylic enamel. As Jeff suggests, at the very least it gives a starting point baseline.
That being said, if you have a product mixing formula for a particular color perhaps you can provide it and we can create another page of data that tabulates the info.
Since there weren't any suggestions on the structure of the spreadsheet, perhaps we can move on to the color schemes. I started out with my standard interior turquoise convertible. This car had been restored by a previous owner, so I'm not sure that the interior colors as noted are 100% correct. The upper dash pad area seems to be darker, so I'm saying Med. Aqua there. Most of the rest of the painted surfaces are lighter - so Light Turquoise on those. Upholstery, plastic, and other soft trim approximates either of these two colors - but are not painted surfaces. Notations indicate which color these soft parts approximate.
Would other interiors in this section of the table follow the same pattern?