Zor, You have good eyes, and I take it that you have many builds under your belt. Your concerns were going to be my next issue to discuss. The bottom doublers are hardwood with the dashed cuts. Directions state to crack at dashes and cut through. The left side I just bent at dash line and left it connected and didnt glue it yet. On the right side, as I was bending at dash line, it broke off, and I didnt glue it yet either. I knew from looking at top of plans, that area would be the start of the bend to narrow the fuse. It isnt a very sharp bend. Oh and the top doublers are light balsa.

I am glad that you are being so abservant to the build. This will help other new builder, and that is why I am posting. So keep the questions coming!
Once again, I dont want to knock this kit, it is a great kit, but my opion is that it is not a first timer kit. It would be a first timer kit if the instructions had photos to help explain.
You really need to read the instruction, and ask your self, ok after this step, what changes will happen with next step.

On to the next step. The instructions state to find F-6, F-7. And place them into right side of fuse. You will need to make sure that the former F-6 and F-7 are 90de, then glue in place. Next you are to place the left fuse side on top of F-6,F7. Make sure its at 90d and glue.

Next step is confusing. It states to glue in place the main landing gear support F-6into position with the markings TF at the front and facing the inside of the fuse.
I have not looked at the rest of parts yet, but F-6 is the former in the last step.
I am going out to build table to do some work, will post more on what I have found of this other F-6.