I have completed the turnout leading from the main branch line to the siding. This, coincidentally, is my first S-scale #4 turnout, completely built in-place. The Tortoise is hooked up, and it controls the turnout's throwbar (made out of PC circuit board). In the photo the Digitrax DS44 is connected to the Tortoise, but the power routing to the turnout's frog had not yet been soldered to the Tortoise. The bottom of the Tortoise is mounted somewhat below the scenery "horizon". The Tortoise will eventually be hidden in the scenery.
Where the Tortoise sits is a two-foot wide module. I have completed the track work on it. That track is part of the main branch line's track.
Work is continuing on into the center section of the layout. I started by removing the smelly foam board, and I am in the process of gluing the ceiling tile to the new sub-roadbed. You can still see some of the foam in the right-half of the center section.