As of today, I will keep you updated using a chart which you can find under http://iseenumbers.com/the-current-status/

Also, I just interviewed the second synaesthete. A very interesting individual who associates characters with numbers as well (in addition to time-space synesthesia) and has an intersting way to visualize chemical structural formulas.

Exciting illustrations are in the making and I hope to be able to share some of them soon.