How to install a Pocket Door

This video shows the installation of a 75mm pocket door kit, this kit can also be double-boarded to suit 100mm stud work.
Sizes range from 686x1981 (2'3) up to a 926x2040
Product:
Pocket Door System Catalogue: www.bullerltd....
Website:
www.bullerltd....
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[@stevegillespie9632]

Where was the angle architrave from

[@nemanjagradinac5419]

what are those architraves? can't seem to find those?