Trust me, I'm with you, shaky hands, too much caffeine, no artistic talent, etc.
I used a mechanical pencil with 0.5 mm fine point (you can buy a pack of these at wally world cheap) and carefully traced my old PG, including every screw hole, truss rod cut out, pickup route etc. I had the added stress of extrapolating exactly where the third pickup was going, so I placed one of the pickups on my paper where I thought it should go and then cut it out and placed it on the bass.
Long story short, it worked out perfectly! Take your time, it's not rocket surgery.
Dingwall, like many manufacturers, make very subtle changes and tweaks to their designs over time, so I doubt it's worth it to any third party to keep templates. If you do a very careful tracing, you shouldn't have to do any final tweaking or sanding at all. Mine dropped right in, every screw-hole lined up perfectly.
PS. If you're really bored, I have a thread where I did a bunch of mods (including new PG) to my 2015 NG2 over here:
Dingwall NG2 to NG3 conversion