Creating new molecule editing programs with cdk

After all the work that has gone into making a flexible core for JChemPaint (the controller and renderer modules) I finally have the opportunity to use it for what I wanted : a small custom program for editing molecules from scratch and displaying the spectrum as you go.
This may not look like much, but compare to this next screenshot:
Obviously this is a fairly unlikely molecule, but (if you believe me :), the new ring has caused the program to re-predict a spectrum (using NMRShiftDb). The point of this was to teach me more about the connection between molecules and spectra.