This IBM PS/2 model 35 from 1991 has been restored as best I could:
RAM expanded from 2MB to 12MB
Malfunctioning 1.44MB floppy drive replaced with 2.88MB floppy drive
VGA ISA card added to bypass malfunctioning onboard VGA
RTC chip modified to bypass dead internal battery and added external battery.
I wanted to install Windows 95, so I replaced the still functioning standard harddisk of 80MB with one of 420MB as well. In the video, Windows 95 (the original release on 13 floppy disks) is installed successfully and the system runs smoothly.