I suggest you use the images below to create your dimensions for the ESP32 Expansion board Mounting Dimensions. 
Tested and configured with Tinkercad. I Couldn't find any good dimensions description online, so I had to troubleshoot my way to calculate the dimensions for the EPS32. It may not be perfect, but the mounting hole dimensions work.

The dimensions are for the center of the circle.
Here are the coordinates(X,Y) Typed out, using SW as reference point. 4 mounting holes labelled SW, NW, NE, SE
SW (0,0), NW (15.01, 51.01), NE (43, 51.01), SE (49, 1.5)


Esp32 Expansion Board Mounting Dimensions

Fantabulous Leelo.stl

Lego Switch Track Servo Motor. 
Note: Use a more robust filament for the gear rack and gear. You will need to use the Servo horn to ensure the Gear does not slip
This model is open (no enclosure), Will be making an enclosure with features.
M3 screws for servo motor.
Still need to use 4x1 lego bits to align the gear rack

Made using thinkercad

Lego Switch Track Servo Motor

Lego SwitchTrack Mounting Plate.stl

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Esp32 Expansion Board Mounting Dimensions

Lego Switch Track Servo Motor