I have just found another use for your light box! Preliminary testing done already, going to be my artificial star generator! I just taped a blank piece of paper of the front and carefully stabbed some holes in it using a pen. It sort of worked, holes were too big to be able to use focusing mask but FWHM reading suggest that the length of my house is JUST long enough (within 1m).
So this week I plan to calculate the filter offsets while Melbourne is having windy, cloudy and rainy evenings