If you are doing this all out of 1mm CF, I can pretty much tell you right now it's not going to work. With that much thrust, you are going to need to have thicker main plates (at least 2mm, better to go with 3 or 2.5) as well as several aluminum stand offs sandwiched in between to provide extra stiffness and support. We design and sell several custom frames and we don't even use 1mm on our tiny FPV quads, must less a heavy lifter. If you don't mind risking your components though, it might be a good experiment to try your original plan and see how long it will last, especially if you already have the 1mm parts cut out. Also, I would be careful of an aircraft that size being controlled by a Naza. I know that many people have done it without issue, but it is outside of DJI's suggested frame size and if you have an issue, the first thing they will say is that you shouldn't have had it on something so large and they won't honor any type of warranty. Just some food for thought.
How are you designing your plates? What CAD software are you using and how are you cutting it out? Can you export to DXF? We have a few CNC's if you ever need anything cut.
I am not using any program, I am just making a simple Square design, and using the frame from my Racer and the terot as a guide. Regarding the rigidity, you are absolutely right. There is too much flex but I will be reinforcing it soon. I may have to order another piece of carbon fiber. I was also planning on building it so I could remove a couple of screws and fold for transport or to put in the closet, but I may not do that. At this point I realize it is probably something I will build, fly and then put away after removing the parts and transferring them onto a real frame. In the end it will be a learning experience and some fun.
