Not Likely
Perhaps you are just not looking at them critically enough. I thought the same thing when I started my tail kit but a more experienced builder pointed out to me that what I thought was perfectly flat was not.
The laws of physics tell us that if we take a flat piece of aluminum and smash it into a three-dimensional object, there will be forces on the object that tends to distort it. Any formed piece of aluminum in your kit will likely need some fluting.
The key to learning to see this it to assure you have a perfectly flat surface upon which you can lay these pieces. A wooden bench top is not optimal. I built my tail at the Alexander Technical Institute and they have a large piece of 3/8 inch steel plate set into a table top. My instructor laid each rib on the plate and pointed out where and why it needed to be fluted or where I might have over fluted. A piece of 1/4 inch class such as a glass cutting board or your wife's glass table top will work well also. Well, maybe not.
I think the key is learning to see the issues you are trying to correct. This isn't necessarily as intuitive as one might think. It isn't difficult once you learn what to look for, but to the neophyte eye, it can be difficult to see and getting an experienced person to point it out to you is usually all that it takes.
Good luck!
