I was wondering if there is a possibility of cutting a 61-keybed for M3 and making a 49-key version of it. Think of it as removing 12 of the lowest keys close to the pitch bend, and then cutting off the metal structure that is not needed any more.
By looking at the original keybed, it seems that mechanically it wouldn't be a big problem.
But the question is whether the remaining keys will work if a portion of the keyboard-panel (which used to hold the missing keys) is cut away, even after making sure that cables needed by the remaining keys stays intact.
The reason for this would be reducing the weight and footprint of the M3, assuming you don't need all 61 keys. You can think of it as an M3 in Radias format.

Thanks,
D.