uhhhh, sounds like a whole bunch of advice for a whole lot of monkey business for an end result
that will look like a hack job.
KISS principle, and do it right will be easier in the long run. This stuff really isn't to hard. Yes,
the sill really does need to run under the studs. No, sistering on little pieces is bad, yes,
stacking more plate is ok.
Couple of ???'s... Do you have sheathing on the outside (steel siding and cedar is not
what I mean). Assuming you do... and that you have access to the studs inside, you
can rack the thing back in line fairly easily. Laser's are great, but string lines are easier
and cheaper. Measure down a random distance from your top plate, at both ends on
one wall. Two nails and a string and you have a measuring point across the whole wall.
Nail on a 2x across several studs. You can jack/wedge against that to raise that section.
i.e. on the 20' wall, I'd probably suggest 4 lifting points. A 4x cut long and a sledge
hammer will raise the wall; so will a jack. Bring it up until the top plat measures a hair longer
than your base measurement (to the string). Let's say you got a max of 2 1/2" of rot.
Mark out (get that chaulk line out, leave the laser in the box) and cut out 3" of studs (the
ole' sawzall works). Lay your plate down (just one), anchor it to the foundation. Don't shoot
it. Wedge's work, the Titan's work great.. Mark out and notch the second plate to fit over
the first. Put it down. It doesn't go on easy??? Raise the wall some more, notch the plate
a bit more. Git it on there. Nail it down, lower the wall back down, toe nail it, use them fancy
A35's, whatever. If you have easy access from your sheathing outside, nail through it into
the new plates. You be done. Did I write to much? I bet the whole thing takes less than a
couple of hours max per wall section.
But hey, what do I know.???