When we arrived on site and checked his work with our transit, the foundation was still out of level by as much as 1 1/2 inches.
We notched the sills using a Porter-Cable fixed-base router equipped with a Bosch 3/4-inch double-flute straight router bit.
To accurately guide the router, I built a simple jig out of four short lengths of 2x4s.
After installing the trusses, we scribed the 2 3/32-inch rim material to fit. To make sure there would be plenty of bearing, we doubled up the rims where we had corrected for the out-of-square walls.