Yes the “junk box” approach is a simple alternative to 3D printing these “linear” transmission spectrograph designs. eg
http://www.threehillsobservatory.co.uk/astro/spectroscopy_19.htm
http://www.threehillsobservatory.co.uk/astro/spectroscopy_18.htm
though I never got round to coupling them to the ALPY mirror slit guider
Claudio Balcon in Italy has recently classified a couple of faint supernovae using a similar home built collimated Star Analyser 100 setup