- Buy CPU from AMD
- Buy GPU from Nvidia
- Buy motherboard from MSI
- Buy RAM from Corsair
- plug them together and put it in a case.
- plug HDMI cable between GPU and handy LCD monitor.
- Install Windows
The point I'm making is there's so much technological development in manufacturing that has to take place before you can even start, it probably wouldn't happen any faster. Just the technology that builds the machines that builds the machines that build the chips is beyond the 1920s.
Turing's papers on computing were all pre-WW2 anyway.