Heavy Metal Apple Keyboards
Heavy, is the word.
These weights a brick. Literally.
AEK64SS keyboard
the above is made of stainless steel. Only a few are made.
there's also a aluminum case version.
see https://clueboard.co/parts/aek64-60-case-for-apple-extended-keycaps
More photos at https://imgur.com/a/wCXv1
Modern M0110 keyboard (DIY)