The X500 Pro is the final product in a line of computer cases designed a few years back (the X500 Plus and later the Evo with a mechanical keyboard) as a tribute to the computers of the '80s and '90s (Commodore, Atari, Sinclair etc...). It's a wedge styled computer case with built-in, full size mechanical keyboard.
The X500 Pro is designed for modern hardware: mini-ITX motherboards (17cmx17cm), Flex-ATX power supplies (these can be found from 150W all the way up to 500W).
I have no affiliation with the project creator. I've just been waiting for this for years and would like to see it succeed.