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Rob,
Could be a great project BUT....
You could keep it real simple and mount the OTA piggyback on the 12" with the grating "in the converging beam" about 50mm infront of the CCD chip at prime focus - but this would still only be a 5" scope - light gathering/ resolution.
An other option is to build a "real" spectroscope using a small 30mm reflection grating (say blazed 600 l/mm). The end result would be a great, but bulky and heavy spectroscope.
The 5" f5 mirror (625mm fl) could be used in a couple of ways - as a Ebert-Fastie or just as a collimator.
There's a spreadsheet SimSpecV4 (and explanatory notes) available in the files area of the astronomical spectroscopy group (see below) which would help you evaluate the possible deigns.
You'd need an entrance slit, some method of guiding and possibly a 200mm imaging lens (depending on the configuration you chose)
All these designs and more are covered in my book "Astronomical Spectroscopy for Amateurs" which I would obviously recommend to you.
Hope this helps.
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