I got Windows 2.01 to install, but not startup; however, the problem is with Windows 2.01 itself and not ReactOS. This version of Windows only likes a very specific version of DOS that ReactOS doesn't emulate. However, I installed it using the NTVDM and a test with DOSBox showed that it did indeed ...

Isn't there quite a lot of docs for it?

Do you even have a serial port onboard?