With the new engine mount fittings trimmed and temporarily installed, I continued working on the lower tunnel. This required building the outboard floor stiffener channels. They are constructed from 0.025 2024-T3 and are pretty straight forward. You do have to be careful of keeping alignment between the inboard floor supports and the forward spar carry through angles. Also, it is important to note that the direction of the flange on the spar carry through is opposite between the top and bottom direction. (I have one scrap support to prove it...) Also, when I laid out the lower skin hole pattern, I had assumed that the flanges were both in the same direction which led me to drill the holes in the skin on the bottom side just a bit too far from the actual flange in the lower spar support angle. As a result, I had to extend the leg of the spar support just a bit to ensure I had enough edge distance. (This is probably confusing...but my message is, when you build the parts around the forward spar, remember the legs go in different directions)
Outboard floor support angle
Supports and forward spar components being aligned
