all outlets and switches are on the interior walls.

There's no insulation in my in-law's house, so fishing wires to the outlets
from the basement should be no problem. As long as there's no blocking in
the wall, the switches won't be too bad either.

It's the full run from top to bottom where blocking is involved that it'll
be an issue. I'm "hoping" the interior walls don't have the blocking, but
haven't had the chance to check that out yet.

I ran the conduit thru the corner of the closet

Seems to be the overall favorite...

Almost everywhere code is going to call for the meter to be outside.
And as soon as you do that, you will an electrician to pull a permit

I already have a permit, and the new panel and meter have already been
inspected and approved. It's just a matter of updating all the individual
circuits now.

The current knob and tube wiring has everything on ONE circuit.

Anthony