There is a plan in the video.
The design is as simple as possible. It is very powerful.

Disk sander 250 mm (9.8 inches) in diameter
Drum sander Width 5 to 300 mm, thickness 5 to 45 mm
Belt sander Belt length 915 mm (9.8 inches) Width 100 mm

The disk sander has a grit size of #80 for roughing and the belt sander has a grit size of #400 for finishing and long materials.　　

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Motor
Brand: Hitachi Industrial Equipment Systems
Type: TFO-KR 300W

Screw terminal block
Brand: Patlite (former Kasuga Denki)
Model Number: T1002

Smart Plug
Brand: Gosund Japan
Model number: WP6-4

Pulley (Outer diameter 63.5mm)
Brand: EBAON
Model number: VP 2-1/2XA1D14M6

Pulley (Outer diameter 50.8mm)
Brand: EVAON
Model number: VP 2-XA1D12M6

V-belt type A (Standard)
Brand: Mitsuboshi Belting
Model No.: A35

Linear shaft (diameter 12mm)

Bearing unit (Set screw type pillow type unit)
Brand: KMT
Model No.: KP001

Double-sided tape (peelable)
Brand: Nitto Denko (Nitto)
Model Number: 5000NS