Acoustic Panels

I hope this tutorial would be a good reference for those of you wanting to craft your own acoustic panels.

Materials & Tools

Wooden Planks
2 Short _{(55cm x 5cm x 2.5cm)}
2 Long _{(120cm x 5cm x 2.5cm)}
Rigid Fibreglass
1 Slab _{(120cm x 60cm x 10cm)} OR 2 Slabs _{(120cm x 60cm x 5cm)}
There's a lot of literature about what is the "best" density.
Do a little Googling and you'll find most sources quote around 64kg/m3 for panels of this size.
Back Fabric
1 piece _{(120cm x 60cm)}
Make sure it is "breathable" (more acoustically transparent).
Front Fabric
1 piece_{(155cm x 95cm)}
Make sure it is "breathable" AND pleasing to your eyes.
Nails
4 pieces_{(at lease 5cm long each)}
Gloves
A pair
Power Drill
Wood Glue
Spray Adhesive

Pre-drill Holes

Pilot a shallow hole on each end of the 2 long planks. Be sure to leave a ~1cm gap from the edge. There is no need to drill through. The holes are simply guides for your screws later.

Form the Frame

Place the nail in the pilot hole and drill it through, connecting it with the short plank as shown.
Optionally, you may apply wood glue for extra strength.

Work on one corner at a time.

When you're down with all 4 corners, you should get a stable rectangular frame.

Staple Back Cloth to Frame

Staple back fabric onto wooden frame. Make sure the fabric is taut.

Glue Fibreglass

If you have 1 slab of 10cm thick fibreglass, hooray you can skip this step.
If, like me, you can only get access to 5cm slabs, you can simply glue the 2 slabs together using a layer of spray adhesive.

Lay Out Cloth + Fibreglass + Back Frame

Lay the front fabric on a flat, open surface. Position the fibreglass in the center of the front fabric (try to be as precise as possible here to reduce adjustments required later on).

Place wooden frame you made earlier (with the back fabric stapled on) on top. Ensure that the back fabric is laid against the fibreglass.

Wrap & Staple

Fold the front fabric up and staple it along the back side of the wooden frame.

Work on the sides first (highlighted in green) and leave the corners alone for now. This will help you tuck in the corners neatly later.

Ensure you pull the front fabric taut as you staple. This will help prevent ugly looking creases.

Staple the Corners

At the corners, fold the fabric as shown, keeping the fabric neatly tucked.

Staple the fabric to the back of the wooden frame.

Trim Off Excess Cloth

Cut off any excess fabric.

You may also staple loose ends onto the wooden frame to keep the back side neat, although there's really no need to do so as nobody's gonna see the back view if you put it against the wall.

Hammer Flat and Done!

Run your fingers gently along the stapled surfaces, and you may realise that your staples are not flat all the way in. Hammer in any protruding staples for safety during handling.

You are done!

Further work:

To hang it up on the wall, you can drill a few screweyes into the inner side of the wooden frame, and attach steel wires to them. Simply hang it up like a picture frame.