Is it not just the 12" version of the 7045? If so the manual for the 7045 should cover most sins.https://www.vinylengine.com/library/jvc/ua-7045.shtml
As mentioned if you already know the mounting distance the rest should be easy. It is just a case of putting the correct sized mounting holes in the right place. I will say I have never used a template in my life and choose to use this method.
Notice it is mentioned on the tonearm database which also gives the null points required. 61mm and 108.6mmhttps://www.vinylengine.com/tonearm_dat ... i=&cw=&mp=
To be honest I think with this information you must be most of the way there