This might be rework off my older Martian or complete new build, I do not remember. I just discovered it is not listed in my builds.
This one has 3mm bottom plate and 2mm top plate that makes it tank. All the edges are manually chamfered. I also designed and 3d printed the antenna holder in the back.

It is rather heavy though. With 5.5" props the weight is not a big problem and paired with 5s battery it is a blast. Pictures are with 6" Kingkong bi-blades that I would like to test.

I had trouble tunning out some mid-throttle oscilations so I added 330uF 35V cap on each ESC and one 1000uF 35V cap on power leads. That seems to solve the issue.