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Unless the design (and your printer) can give at least 100 lines/ mm - then all you have is a glorified Ronchi screen. The resolution will be very poor.
IMHO the easiest and fastest way is either a good prism infront of a telelens (say 135mm etc) or one of the P-H student gratings and use either the needle trick or mount a pencil sharpener slit in the end of a tube/ box about 1400mm long - use a mirror if necessary to shine the sunlight onto the slit and image it with a grating on the front of the lens.
This will definately show the Fraunhofer and Telluric (Atmosphere) lines etc etc. The set up can also be used to show the spectra from various lamps (Flouro/ Neon/ Incandecent etc) as well as the effects of various filters....Some neat projects there....
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