Cutting the left side of the kitchen window opening...

...and the right side.

The first full log section is out...

...and now the second. The next upper and next lower logs will be the header and sill logs.

Jeff uses the chainsaw to make the vertical kerf cuts in the sill log down to the desired sill depth.

Grinding down the high spots after knocking out the log pieces created by the vertical kerf cuts.

Knocking out pieces in the header log.

We found it was sometimes easier to use the chainsaw wheel on the angle grinder to smooth out spot on the header log.