Press the key N to open the properties panel.

Item / transform

Выставляем высоту нашего объекта (Dimensions Z=2,5м)

Front Orthographic (num pad 1)
Add (Shift A) image / reference / open images front

Right Orthographic (num pad 3)
Add (Shift A) image / reference / open images saze

User Perspective
Move (Shift Spacebar G)

Select images side
open Object Data Properties / Opacity /

Сheck the box / Meaning = 0.250

Opacity / Side = Front

Front Orthographic
Select images side / Select images front / individual Origins

Move and Scale

New Collection
Rename images / Rename New Collection
Add images to New Collection

Filter / SelectTable

Remove selection

Select Cube / Delete Cube
Save as…

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