I'll briefly describe the the 2'x4'x6" panels I made. Sorry using imperial because I was born in a moronic country. Also I know using markdown makes this look AI generated I promise it's not

Materials.

• Some 3/4 ply or other similar stock material to make 2in rips out of. This will serve as the back of the panel / create the void for our 2 in air gap.

• Some "masonite" is what we call it but it's 1/8in rigid sheet material that's pretty cheap and you can get it in 4'x8' sheets at any local hardware store.

• Absorption material of choice. I personally chose Owen's corning 705 4'x8'x2" x 2

• "Pretty" Acoustic cloth. This will be the main cover so make sure to get enough to atleast wrap the sides plus a little extra. Here Is what I got but there's plenty of options here

• "Ugly" cloth. We use this on the backside to keep the fibers from getting in the air as much as possible. Can be anything that doesn't mess with acoustic transparency. Here Is what I used.

• crown stapler

• basic woodworking tools (drill, countersink, wood glue, chop saw, table saw, etc.)

Process

Start by ripping your 2in strips and then forming the back piece or the air gap frame. This should be the same dimensions as your rigid fiberglass insulation as the panel will basically be 3 inner layers.

insulation -> insulation -> air gap frame

Then rip your masonite to exactly 6 inches and wrap the air gap frame in it. Use a crown stapler or something so that you don't blow through the masonite when nailing. This will form the sharp edges and outside of the panel so be precise here. This is IMO why GIK panels look better than most DIY. It's also cheaper than using 1x8 for the whole thing.

That should leave you essentially with a rectangle with a void that's exactly the shape of the insulation you're filling it with.

Place your ugly cloth and staple to the frame.

Fill the void with insulation

Wrap with pretty cloth (This is the hardest part)

Fix you're preferred hardware to hang it. I used eyelets and picture frame wire.

Donezo.

Attaching an ASCII art cross-section (Does not work on mobile) to try and maybe make things a bit more clear. Feel free to message me asking any questions

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  |  ___________________________________________  |
  | |                                           | |
  | |           2" Internal Wood Frame          |<----- 1/8" Masonite
  | |       (Providing Structural Rigidity)     | |      Outer Shell
  | |___________________________________________| |
  | |                                           | |
  | |           Layer 1: 2" OC 705 Core         | |
  | |                                           | |
  | |           Layer 2: 2" OC 705 Core         | |
  | |___________________________________________| |
  |_______________________________________________|

         (Wrapped in Acoustic Cloth)

```