Got the TT roughed in with a combination of Great Stuff and vinyl joint compound to fill the gap around the edge of the pit wall (sanded smooth); fill the holes where the bolts went in; and to smooth out the transition of the whisker tracks to the TT. Then painted everything earth brown and covered with fine turf to match the surrounding layout.
I also hooked up the power and made sure everything was working correctly (works great) and am in the process of completing
and installing the arch, cab, bogies and railings and also mocked up the lead-in track.