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The UK Mirror Class Association used to own a jig, built by Alistair Duffin (Duffin Marine) available to members to build kits on. Sadly in 2020 it had to be disposed of as the current builder had finished with it and could not store it for any longer. It was advertised as available on the MCA site and the two Facebook groups from 18th November 2019 into January 2020, but no prospective builders came forward to take it on. Nobody on the MCA Committee had space to store it.
Click slideshow to see larger scans
For those who want to make their own jig, I've started, but not finished, drawing the jig in a 2D CAD package, AutoCAD, here uk_mca_mirror_jig.dwg (right click link and "save as"). Above are some very rough sketches of the jig which were never intended for publication. Needless to say, use both these at your own risk as it's entirely possible they contain errors.