Separated halves is the easiest of your requirements. That is a pretty well solved problem in the keyboard community (see ergodox, etc.).
Having the halves communicate wirelessly is a bigger challenge, but still potentially solvable. The easiest solution would be to have each half register as a separate board. Then because it is wireless you have the issues of batteries and charging and stuff.
The curve might also be tough, especially when combined with the wireless part. The easiest solution would be to have a plate cut, heat it up to soften it slightly and then bend it into the curve that you want. There would probably be a lot of trial and error involved in that though, and it may be faster (though a lot more expensive) to design the final 3D version of it in a cad program and have it milled as one big block.
Standard cherry-style keys will be much easier to source than scissor keys.
Having the halves communicate wirelessly is a bigger challenge, but still potentially solvable. The easiest solution would be to have each half register as a separate board. Then because it is wireless you have the issues of batteries and charging and stuff.
The curve might also be tough, especially when combined with the wireless part. The easiest solution would be to have a plate cut, heat it up to soften it slightly and then bend it into the curve that you want. There would probably be a lot of trial and error involved in that though, and it may be faster (though a lot more expensive) to design the final 3D version of it in a cad program and have it milled as one big block.
Standard cherry-style keys will be much easier to source than scissor keys.
This geekhack thread might give you some ideas: https://geekhack.org/index.php?topic=70221.0