Also the board is version 2.1 but the CPU power delivery circuit appear to be exactly the same as the one from mentioned thread.

I resurrected the motherboard using a KT818G for Q8 and a KT819G for Q7 that I had in my spare box.
For D11 I put an SBL2040CT and for CT8 a 1500uF/6.3V capacitor.
For the BIOS I wrote an AM27C010 with the BIOS file from The Retro Web.
Everything seems to work fine except that Q7 and Q8 are getting too hot on a Pentium 133MHz.
So I guess I'll need another pair of transistors with a larger Ic.

I finally had time to check the power supply circuit of this board.

Since I didn't have any original components, I used a pair of D44VH10 (NPN)/D45VH10 (PNP) for Q7/Q8.

The pair was getting very hot during testing with a Pentium 200 MMX, so I moved D11/Q7/Q8 to a heatsink mounted on top of the PCB using 3 screws and the existing holes for the relocated components.

I also had to cut the trace between pin 9 of the TL494 and Q10, because after a short period of time the IC became too hot to touch, so I put a 68 ohm resistor.

The PWM output was a bit too "hairy", so I put ferrite beads on pin 2 of D11 and on the B&E terminals of Q7, and also put a 470 ohm resistor between the B&E terminals of Q7.
Testing, using a DOS fractal generator, with a Pentium 200MMX, the heatsink temperature stabilized around 75 degrees Celsius, and with a Pentium 166 (non-MMX) it stabilized around 50 degrees.