It's finished! With Granite caps and modifiers and some blanks too (no multimedia keys for granite :().
My layout is this one.
The keyboard (which I am particularly proud of) is:
It is working (yes, I'm still amazed!) and I found it very easy to put in the keycaps. Now... I wonder which cap profiles other people are using (Granites are DSA). Also, I think some Pexon cables will fit in quite nicely :)
I think my typing speed will go down massively for the next few months at home while I embark on teaching myself how to type properly :)
I'll post the full list of stuff I had to buy to make this shortly.