@thor I'm doing something similar with a Near IR Spectrometer. I'm reluctant to build it when LPAS is not too much more difficult but a lot more impressive.
I still remember the DSP and how disappointing it was. To quote The Greatful Dead, "What a long strange trip it has been." I wish you the best of luck Thor. I'm turning into a Cenobite from my perversions and I have no regrets.