Nice spectra Ken,
I've been slowly working on getting a "reflective slit" (needle) solar instrument together based on Maurice Gavin's design. The best resolution I've got to date has been a 2.5 A/px by putting the star analyser in front of a 135mm slr + 2x teleconverter on the 350D. Makes interesting spectra of street lights!
On a rare clear night recently, got a good spectra of Fomalhaut..
For the "needle" instrument, I've got some transmission grating, 500 lines/mm, so it'll be interesting to see how well that works.