ShadowRun Matrix 1st/2nd Ed to VR2/3rd Ed Help

[Morgan Vening]

I'm about to start a new campaign (first in ten years!), and have a
preference for 3rd Edition (namely because most of my stuff is 1st to
3rd).

The problem is with a lot of that stuff being 1st and 2nd Ed, has
anyone come up with a simplified (even raw) way of converting the old
System Maps architecture into the VR2/3rd Ed Security Rating/ACIFS?

I obviously don't expect it to be perfect, but I'm going in blind. I
don't want to put in systems that the party walk through, but don't
want ones that'll kill them outright either.

Morgan Vening