Resurgance, thanks for the kind words and I'm happy my work could be of use to you. I would caution that blue LEDs don't play too nicely (at least the ones I used) with variable contrast paper. Please see the 10th paragraph section "To test how darkroom paper..." in my article above on LED colors and my spectrograph pictures. The only reasonable solution would to be to filter out the green crossover within the blue LEDs--probably by gluing tiny bits of filter material with clear optical cement over every single blue LED. A silly notion but it may work for the determined.
I never did hear back from Stormpetrel. I assume it all worked out and he just got busy printing. Not a bad thing!