That steampunk keyboard is stunningly beautiful and a somewhat similar project has been on my "to-do" list for quite a while.
That said, the IBM SSK is a sought-after keyboard and, arguably, the most valuable component of the "SSK" is the case (because you can "cut and fit" all the other pieces from cheap ordinary Model Ms) so my advice is:
Regardless of whatever else you do, preserve the SSK case and muck around with the rest of it.
All of that said, going to that level of time and effort on a Model M is ludicrous. Make it a Model F project.