Interesting. I see some things I have to question, but you are trying to figure out the angle at which the two hole features are created. Normally, that would be specified. Also the key feature for closure doesn't look interlocking but it does look like it should in the flat pattern on the right, but not on the left. Is there an allowable gap?
You may not have all the information you need. I would think there is a finished OD or ID somewhere. I would begin with that size cylinder; determine the proper K or Y value of the material for that size radius; unfold and add features; then bend back. Some features may fail on a bend back so test this often. Sheetmetal parts do not like thinning but I think it can handle countersink holes well enough. Not sure about the chamfers either. If a feature fails at the sheetmetal level, you could consider placing it in an assembly and finishing the part with assembly cuts where applicable if needed.
I am not sure what is to be done post-bend, but those features are certainly possible at an assembly level depending on the shop details you need.
