Chapter 15 Firewall
I ordered the MKCS-71 and CS-72 Bracket pieces from CGProducts and the sheaves from ACS and assembled them. I also fitted MKCS-71 to the lower firewall, which required a minor amount of hole opening to match the pre-burried bolts in the firewall. After I had run the rudder conduit cable (referenced below in Ch16 Step 5, I could see that I needed to grind about 1/8" of opening in the electrical conduit corner on one side to align and flox the rudder wire conduit and line up well with the sheave.
It turns out that I didn't mount the rudder turning blocks throughout all the chapter work until after mounting the engine. The reason for this is that these brackets and the pulley's are not needed until I get the wings mounted for good and connecting the rudders. I wanted to keep them safely stored until this point.
The next big work on the firewall associated with Ch 15 is when the fire shield is fitted along with the fiberfrax. I have this documented in Ch 23 Engine stuff because it's so closely linked with all the engine associated protrusions through the firewall.
There's a lot of work on the firewall that occurs much later when the spar gets mounted and then again when the engine get's mounted, and then as everything gets integrated (controls, cowlings, etc) late in the build. Take a look at those chapters and the Hangar integration for more notes on stuff related to the firewall.