F11-01 Fuselage Box Assembly.
Located, Pilot drilled, and clecoed:
F16-10 Lower Forward Cross Tie, and
F16-09 Upper Forward Cross Tie.

F17-01 Lower Firewall. I used the hand seamer to make the two required bends.
I then located, pilot drilled and clecoed the lower firewall to the Fuselage Box Assembly.

I placed the motor mount in place just to see how it fit and looked. It appears to fit very well.

Click on a picture to enlarge it: