I'm tired of talking about how I installed the F-902 bulkheads. I've done it twice already, Always messing up the holes to the F-7101 gear attachment web. (It is a bit tricky to get the fit right).
I'll be brief. I did everything as I did before, Ensured the F-7101 web was tight against the longeron. I used 0.040" scrap to simulate the bottom skin (yes it matters). I used a few clamps on the assemble to hole it all tight. After drilling, I installed the floor skin to double check all of the alignment. The result is excellent. Finally a F-902 bulkhead with correct holes drilled to the gear web. Sheesh!
I then removed the floor skin so that I can work on the lower tabs (upper in the picture.....remember the fuse is upside down). I marked the edge of the longeron on the tab (in red) and then I marked out lines offset from the edges by about 0.245". This gave me an idea of where I want to place the #30 hole.
I then re assembled and then transferred the hole to the lower longeron.
The fit is really good.