This video is about parallel risers or staging platforms.
My sincere apologies about the audio-
I have found some product links that may help.
Coffin Locks/ Roto Locks:
[ Ссылка ]

Hinges:
[ Ссылка ]


There are two styles outlined:
The short one- used in a home theatre
The 16” tall one used for staging.
I suggest 3/4” birch plywood. It has few to no voids and is quite nice to work with.
If you make the riser taller than 16”, I would make the uprights wider- perhaps 4” wide not 3.5” wide.
Beyond that I would hesitate to arm-chair carpenter as I am not there for the assembly and use of the staging.

Here is a link to the playlist that has the step by step assembly of the staging platforms:
[ Ссылка ]

Within that Playlist I have 3 videos specifically for the staging platforms.
[ Ссылка ]
[ Ссылка ]
[ Ссылка ]
I wish you good luck with your build!


Best
J

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