Here is My entry for theMobile Meeting RoomThe aluminum version is a STEP file

What you have here is 2 versions. One versionuses extruded aluminum (see parts drawing)and the sound proofing material is frame withaluminum with acrylic windows. This is a morehigh end version. Not really a DIY application. butit shows how it can be made if you replaced the aluminum with woodlike version 2

Version 2 is a DIY application.All that is needed isPlywood,2x4'sSimpson Strong-Tie bracketsAcrylicSound proof panels (see image)

Frame each sound proof panel and then attached them togetherat the top and bottom. This could be any size needed. dependingthe number of panels you use.Both versions show a pocket door system. Either swinging or pocketdoor could work.You can see how the aluminum version is assembled in the photos. Some steps would be skipped if you use the wood version.

The last 2 image you see is A wood version and a large 4 wall room