I have verified my measurements and focal distances using my mock prototype enclosure assembly and laser collimation tube assembly. I am presenting my data as my 1st official recorded test (DSLR0012[1a]). Below is the plot data and spectral image of the laser scan ( Aries 532nm green laser/150mW/DPSS/CW) and the FWHM data.

Also I am including the measurement drawings showing the exact placement and focal distances for the mirror and diffraction grating since these where not stated in the original quoted paper.